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SIG SAUER + Gun Parts Sig Sauer Gun Parts SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + AR 15 Parts Sig Sauer AR15 Parts + AR15 Upper Receivers Sig Sauer AR15 Upper Receivers SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + Rifle Parts Sig Sauer Rifle Parts + AR 15 Parts Sig Sauer AR15 Parts + AR15 Upper Receivers Sig Sauer AR15 Upper Receivers SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + AR 15 Parts Sig Sauer AR15 Parts SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + Rifle Parts Sig Sauer Rifle Parts + AR 15 Parts Sig Sauer AR15 Parts SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + Rifle Parts Sig Sauer Rifle Parts SIG SAUER Upper Mcx

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Image of SIG SAUER Upper Mcx - WUAMCX-5B-300B-BLK-TAP

SIG SAUER Upper Mcx - WUAMCX-5B-300B-BLK-TAP

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By adding to cart, I understand and agree to the Domestic Restricted Product Policy and certify that I will comply with applicable federal, state and local laws and regulations.

Questions & Answers

Will the Sig collapsing brace work with the adapter supplied in this kit, or will it only work with a side folder? Expert Answer

The rear 1913 adapter unfortunately will only fit the side folding braces.

by Kurt Colbourne, Gear Expert, September 20, 2021

See 1 More Answer

So this will fit on a mpx lower no problem?

this will fit any mil spec ar15 lower

by Bloodhound, Verified Owner, September 2, 2022

View All Q&A You Have a Question? Ask!

Customer Reviews

Most Recent Reviews

great upper by Mike, Verified Owner, September 11, 2021

Love the rattler upper. Sig and OP have been wonderful to work with. I’d highly recommend. Great option for cqb and love subs. I really wish we didn’t have to write a novel. You should def buy this. Thanks OP for the great upper, fast shipping and ...
Read More...

Read 1 Review

Product Discontinued by Manufacturer

SIG SAUER Upper Mcx has been discontinued by SIG SAUER and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Receivers yourself to try and find the perfect replacement for you!

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ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

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Product Info for SIG SAUER Upper Mcx

Upper, Sigmcx, 300 Blk, 5.5 In, Rattler, Blk, Semi, Al Mlok Hg

Package Contents:

SIG SAUER Upper Mcx

5.56x45mm NATO Ammo

1–28 / 28

PMC Ammunition X-TAC, 5.56x45mm NATO, 55 grain, Full Metal Jacket, Brass, Centerfire Rifle Ammo, 20, 556X

PMC Ammunition X-TAC, 5.56x45mm NATO, 55 grain, Full Metal Jacket, Brass, Centerfire Rifle Ammo, 20, 556X

List: $15.99 (Save 36%)

PMC Ammunition X-TAC Light Armor Piercing 5.56x45mm NATO 62 Grain Brass Cased Centerfire Rifle Ammunition

PMC Ammunition X-TAC Light Armor Piercing 5.56x45mm NATO 62 Grain Brass Cased Centerfire Rifle Ammunition

As Low As (Save Up to 29%)

See all 2 models

Winchester Super Match

Winchester Super Match

As Low As (Save Up to 15%)

$0.41 - $2.75/Round

See all 20 models

Hornady BLACK 5.56x45mm NATO 75 Grain InterLock HD SBR Centerfire Rifle Ammunition

Hornady BLACK 5.56x45mm NATO 75 Grain InterLock HD SBR Centerfire Rifle Ammunition

As Low As (Save Up to 14%)

See all 2 models

Winchester USA 5.56x45mm NATO 62 grain Green Tip M855 Full Metal Jacket Boat Tail FMJBT Brass Centerfire Rifle Ammunition

Winchester USA 5.56x45mm NATO 62 grain Green Tip M855 Full Metal Jacket Boat Tail FMJBT Brass Centerfire Rifle Ammunition

As Low As (Save Up to 54%)

$0.65 - $0.82/Round

See all 7 models

Winchester USA 5.56x45mm NATO 55 grain Ball (M193) Full Metal Jacket Brass Centerfire Rifle Ammunition

Winchester USA 5.56x45mm NATO 55 grain Ball (M193) Full Metal Jacket Brass Centerfire Rifle Ammunition

As Low As (Save Up to 26%)

$0.59 - $0.78/Round

See all 6 models

Freedom Munitions 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammunition

Freedom Munitions 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammunition

As Low As (Save Up to 19%)

$0.53 - $0.59/Round

See all 2 models

Federal American Eagle 5.56x45mm NATO 55 Grain Full Metal Jacket Boat Tail Brass Cased Rifle Ammunition

Federal American Eagle 5.56x45mm NATO 55 Grain Full Metal Jacket Boat Tail Brass Cased Rifle Ammunition

As Low As (Save Up to 25%)

$0.67 - $0.81/Round

See all 2 models

Hornady Frontier 5.56x45mm NATO 55 Grain Hollow Point Centerfire Rifle Ammunition

Hornady Frontier 5.56x45mm NATO 55 Grain Hollow Point Centerfire Rifle Ammunition

As Low As (Save Up to 24%)

$0.65 - $0.69/Round

See all 3 models

Atomic Ammunition Cycling Defense AD77 5.56x45mm NATO 77 grain Boat Tail Hollow Point Brass Cased Rifle Ammunition

Atomic Ammunition Cycling Defense AD77 5.56x45mm NATO 77 grain Boat Tail Hollow Point Brass Cased Rifle Ammunition

As Low As (Save Up to $13.01)

$1.47 - $1.54/Round

See all 2 models

Hornady Frontier 5.56x45mm NATO 62 Grain Full Metal Jacket Centerfire Rifle Ammunition

Hornady Frontier 5.56x45mm NATO 62 Grain Full Metal Jacket Centerfire Rifle Ammunition

As Low As (Save Up to 18%)

See all 2 models

Hornady Frontier 5.56x45mm NATO 68 grain Boat-Tail Hollow Point Brass Cased Centerfire Rifle Ammo, 20 Rounds, FR310

Hornady Frontier 5.56x45mm NATO 68 grain Boat-Tail Hollow Point Brass Cased Centerfire Rifle Ammo, 20 Rounds, FR310

List: $19.60 (Save 13%)

Hornady Frontier 5.56x45mm NATO 55 Grain Brass Cased Full Metal Jacket Rifle Ammo, 250 Rounds, FR604

Hornady Frontier 5.56x45mm NATO 55 Grain Brass Cased Full Metal Jacket Rifle Ammo, 250 Rounds, FR604

List: $204.99 (Save 28%)

Barnes Vor-TxRifle Cartridges, 5.56x45mm NATO, TSX Boat Tail, 70 Grain, 20 - Rounds, *31191

Barnes Vor-TxRifle Cartridges, 5.56x45mm NATO, TSX Boat Tail, 70 Grain, 20 - Rounds, *31191

List: $43.99 (Save 10%)

PMC 556M55BP Battle Pack 5.56 NATO 62 Gr Light Armor Piercing LAP

PMC 556M55BP Battle Pack 5.56 NATO 62 Gr Light Armor Piercing LAP

List: $89.00 (Save 17%)

First Breach 5.56 NATO 55 Grain Full Metal Jacket Boattail New C220 Brass Cased Rifle Ammo, 1000 Rounds, 50009

First Breach 5.56 NATO 55 Grain Full Metal Jacket Boattail New C220 Brass Cased Rifle Ammo, 1000 Rounds, 50009

List: $599.99 (Save 17%)

Hornady BLACK 5.56x45mm NATO 62 grain Full Metal Jacket Brass Cased Centerfire Rifle Ammo, 20 Rounds, 81263

Hornady BLACK 5.56x45mm NATO 62 grain Full Metal Jacket Brass Cased Centerfire Rifle Ammo, 20 Rounds, 81263

List: $24.99 (Save 23%)

Hornady Superformance 5.56x45mm NATO 75 grain Boat-Tail Hollow Point Match Brass Cased Centerfire Rifle Ammo, 20 Rounds, 81264

Hornady Superformance 5.56x45mm NATO 75 grain Boat-Tail Hollow Point Match Brass Cased Centerfire Rifle Ammo, 20 Rounds, 81264

List: $41.40 (Save 23%)

Prvi Partizan RangeMaster, 5.56 NATO, 55 Grain, Full Metal Jacket, 20 Round Box PPRM5561

Prvi Partizan RangeMaster, 5.56 NATO, 55 Grain, Full Metal Jacket, 20 Round Box PPRM5561

List: $31.47 (Save 60%)

AmmoDyn 5.56x45mm NATO 55 grain Full Metal Jacket Brass Cased Rifle Ammo, 30 Rounds, PM-55655-30

AmmoDyn 5.56x45mm NATO 55 grain Full Metal Jacket Brass Cased Rifle Ammo, 30 Rounds, PM-55655-30

List: $26.95 (Save 18%)

Fort Scott Munitions, 5.56x45mm NATO, 55 grain, Copper Solid, Brass, Centerfire Rifle Ammo, 20, 556-055-SCV

Fort Scott Munitions, 5.56x45mm NATO, 55 grain, Copper Solid, Brass, Centerfire Rifle Ammo, 20, 556-055-SCV

List: $28.32 (Save 12%)

Barnes Vor-TxRifle Cartridges, 5.56x45mm NATO, TSX Boat Tail, 62 Grain, 20 - Rounds, *31190

Barnes Vor-TxRifle Cartridges, 5.56x45mm NATO, TSX Boat Tail, 62 Grain, 20 - Rounds, *31190

List: $70.88 (Save 39%)

PMC 556XBP Battle Pack 5.56 NATO 55 Gr Full Metal Jacket Boat Tail FMJBT

PMC 556XBP Battle Pack 5.56 NATO 55 Gr Full Metal Jacket Boat Tail FMJBT

List: $140.00 (Save $12.51)

PPU 5.56x45mm NATO 0 grain Brass Cased Blank Ammo, 20 Rounds, PPB556

PPU 5.56x45mm NATO 0 grain Brass Cased Blank Ammo, 20 Rounds, PPB556

Hornady Frontier 5.56x45mm NATO 75 grain Boat Tail Hollow Point (BTHP) Brass Centerfire Rifle Ammunition

Hornady Frontier 5.56x45mm NATO 75 grain Boat Tail Hollow Point (BTHP) Brass Centerfire Rifle Ammunition

As Low As (Save Up to 17%)

See all 2 models

Veteran Ammo Defense 5.56x45mm NATO 62 grain Hollow Point Centerfire Brass Cased Pistol Ammo, 20 Rounds, HMBX-556-24

Veteran Ammo Defense 5.56x45mm NATO 62 grain Hollow Point Centerfire Brass Cased Pistol Ammo, 20 Rounds, HMBX-556-24

List: $49.99 (Save 23%)

Hornady Frontier 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammunition

Hornady Frontier 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammunition

As Low As (Save Up to 17%)

$0.65 - $0.67/Round

See all 3 models

Veteran Ammo Defense 5.56x45mm NATO 62 Grain Full Metal Jacket Centerfire Brass Cased Pistol Ammo, 20 Rounds, HMBX-556-25

Veteran Ammo Defense 5.56x45mm NATO 62 Grain Full Metal Jacket Centerfire Brass Cased Pistol Ammo, 20 Rounds, HMBX-556-25

List: $49.99 (Save 22%)

Gun Parts and Accessories

1–30 / 30

Strike Industries Dual Folding Adapter Stabilizer, Black, One Size, SI-FSA-DUAL-STAB

Strike Industries Dual Folding Adapter Stabilizer, Black, One Size, SI-FSA-DUAL-STAB

List: $197.95 (Save $10.00)

DFCO Kung Fu Grip, Black

DFCO Kung Fu Grip, Black

As Low As (Save Up to 15%)

See all 13 models

SIG SAUER Fixed/Folding Pivoting Contour Brace w/ Locking Hinge

SIG SAUER Fixed/Folding Pivoting Contour Brace w/ Locking Hinge

As Low As (Save Up to 32%)

See all 3 models

Strike Industries Sig MPX/MCX Stabilizer, Black, One Size, SI-STAB-MPX/MCX

Strike Industries Sig MPX/MCX Stabilizer, Black, One Size, SI-STAB-MPX/MCX

List: $179.95 (Save $10.00)

KNS Precision AR15 Buffer to Picatinny Rail Adapter Kit

KNS Precision AR15 Buffer to Picatinny Rail Adapter Kit

See all 1 models

SIG SAUER MCX Stock Adapter Kit, Black, 2401191-R

SIG SAUER MCX Stock Adapter Kit, Black, 2401191-R

List: $166.99 (Save $9.50)

Reptilia CQG Pistol Grip For AR-15/SR-25/SIG MPX/MCX/FN SCAR

Reptilia CQG Pistol Grip For AR-15/SR-25/SIG MPX/MCX/FN SCAR

List: $29.89 (Save Up to 39%)

See all 4 models

Fortis Manufacturing Hammer SIG Sauer MCX 5.56mm Charging Handle

Fortis Manufacturing Hammer SIG Sauer MCX 5.56mm Charging Handle

As Low As (Save Up to 38%)

See all 4 models

Next Level Armament NLA Sig Sauer MCX Rifle Charging Handle, Black, NLX706

Next Level Armament NLA Sig Sauer MCX Rifle Charging Handle, Black, NLX706

List: $80.00 (Save 18%)

KNS Precision Galil-Picatinny Stock Adapter, Black, Galil-Picatinny St Adap

KNS Precision Galil-Picatinny Stock Adapter, Black, Galil-Picatinny St Adap

Next Level Armament NLA Sig Sauer MCX Rifle Charging Handle w/ Block Kit, Black, NLX704

Next Level Armament NLA Sig Sauer MCX Rifle Charging Handle w/ Block Kit, Black, NLX704

List: $103.00 (Save $6.00)

Radian Weapons Raptor-LT Charging Handle, SIG MCX, Black, R0364

Radian Weapons Raptor-LT Charging Handle, SIG MCX, Black, R0364

Geissele Super Charging Handle MCX, Black, 05-635B

Geissele Super Charging Handle MCX, Black, 05-635B

List: $158.72 (Save 12%)

Reptilia Puller MCX Chargings Handle

Reptilia Puller MCX Chargings Handle

List: $104.95 (Save 10%)

See all 2 models

DFCO Kung Fu AR Grip, Black, CARTON-10-KFG-BLK

DFCO Kung Fu AR Grip, Black, CARTON-10-KFG-BLK

List: $200.00 (Save 28%)

SIG SAUER MCX Virtus 9in 300BLK Caliber Exchange Kit, Black, WCALX-MCX-300B-9B-LT

SIG SAUER MCX Virtus 9in 300BLK Caliber Exchange Kit, Black, WCALX-MCX-300B-9B-LT

SIG SAUER Bolt Assy, Tapered Lug, .300, Rattler O Ring, KIT-RATTLER-BOLT

SIG SAUER Bolt Assy, Tapered Lug, .300, Rattler O Ring, KIT-RATTLER-BOLT

List: $199.99 (Save 12%)

SIG SAUER Insert - Cam Path, 2400541-R

SIG SAUER Insert - Cam Path, 2400541-R

SIG SAUER Lever - Gas Valve, 2400901-R

SIG SAUER Lever - Gas Valve, 2400901-R

List: $47.99 (Save $3.00)

SIG SAUER Deflector, Low Profile, Black, 2401436-01-R

SIG SAUER Flash Hider, 3 Prong, 5.56, FLASHHIDER-3PRONG-556

SIG SAUER Flash Hider, 3 Prong, 5.56, FLASHHIDER-3PRONG-556

SIG SAUER Fire Control Selector, Semi, 1701199-R

SIG SAUER Fire Control Selector, Semi, 1701199-R

List: $39.99 (Save 10%)

SIG SAUER MCX Rattler Upper Receiver Assembly, .300 BLK, M-LOK Handguard, 5.5 inch, Black, UAMCX-5B-300-BLK-TAP

SIG SAUER MCX Rattler Upper Receiver Assembly, .300 BLK, M-LOK Handguard, 5.5 inch, Black, UAMCX-5B-300-BLK-TAP

List: $1,999.99 (Save 18%)

SIG SAUER Forward Assist Springs, 1700027-R

SIG SAUER Forward Assist Springs, 1700027-R

List: $8.99 (Save 11%)

SIG SAUER Spring - Barrel Clamp, 2400616-R

SIG SAUER Spring - Barrel Clamp, 2400616-R

List: $8.99 (Save 11%)

SIG SAUER Plunger, FPS, 2401430-R

SIG SAUER Plunger, FPS, 2401430-R

SIG SAUER Spring - Extractor, Heavy, 2401641-R

SIG SAUER Spring - Extractor, Heavy, 2401641-R

List: $8.99 (Save 11%)

SIG SAUER Spring - Bolt Catch, 2400908-R

SIG SAUER Spring - Bolt Catch, 2400908-R

List: $8.99 (Save 11%)

SilencerCo Sig Sauer MCX Gas Defeating Charging Handle, Black, AC5702

SilencerCo Sig Sauer MCX Gas Defeating Charging Handle, Black, AC5702

List: $124.10 (Save 22%)

SIG SAUER Fire Selector Cap, Short, Ambi, 1701200-R

SIG SAUER Fire Selector Cap, Short, Ambi, 1701200-R

Gun Stocks

1–9 / 9

Strike Industries Dual Folding Stock, Ambidextrous, AR-15/AR-10/CZ Scorpion EVO 3/SIG Sauer MCX/Brugger & Thomet APC9/CZ BREN 2/Ruger PC Charger/CZ Scorpion, Black, One Size, SI-FSA-DUAL-STOCK

Strike Industries Dual Folding Stock, Ambidextrous, AR-15/AR-10/CZ Scorpion EVO 3/SIG Sauer MCX/Brugger & Thomet APC9/CZ BREN 2/Ruger PC Charger/CZ Scorpion, Black, One Size, SI-FSA-DUAL-STOCK

List: $197.95 (Save $10.00)

SIG SAUER Stock Adapter - 1913 Interface Folding Knuckle, SIG MCX / SIG MPX, Black, ADAPTER-X-FOLD

SIG SAUER Stock Adapter - 1913 Interface Folding Knuckle, SIG MCX / SIG MPX, Black, ADAPTER-X-FOLD

SIG SAUER MCX/MPX Minimalist Plus Locking Folding Rifle Stock, Black, 8901411

SIG SAUER MCX/MPX Minimalist Plus Locking Folding Rifle Stock, Black, 8901411

List: $249.99 (Save 15%)

SIG SAUER MCX/MPXMinimalist Locking Folding Rifle Stock, Black, 8901410

SIG SAUER MCX/MPXMinimalist Locking Folding Rifle Stock, Black, 8901410

List: $249.99 (Save 15%)

SIG SAUER MCX/MPX Visor Folding Rifle Stock, Black, 8901412

SIG SAUER MCX/MPX Visor Folding Rifle Stock, Black, 8901412

List: $299.99 (Save 16%)

SIG SAUER MCX/MPX Collapsible Stock Black

SIG SAUER MCX/MPX Collapsible Stock Black

List: $299.99 (Save 17%)

SIG SAUER MCX/MPX Folding Rifle Stock

SIG SAUER MCX/MPX Folding Rifle Stock

As Low As (Save Up to 16%)

See all 2 models

Samson The S.A.S II Tactical Folding Stock, Black, 04-06141-01

Samson The S.A.S II Tactical Folding Stock, Black, 04-06141-01

List: $335.00 (Save $16.75)

SIG SAUER MCX/MPX/MCX-Spear Folding Rifle Stock, Flat Dark Earth, 8901407

SIG SAUER MCX/MPX/MCX-Spear Folding Rifle Stock, Flat Dark Earth, 8901407

List: $299.99 (Save 10%)

SIG SAUER Upper Mcx Accessories

1–10 / 10

SIG SAUER Electro-Optics SOF2R100 Foxtrot2 Black Anodized, SOF2R100

SIG SAUER Electro-Optics SOF2R100 Foxtrot2 Black Anodized, SOF2R100

List: $189.99 (Save 21%)

SIG SAUER Iron Sight Set, Flip Up, fits M1913 Rail, Black, SITE-SET-1913-FLIP

SIG SAUER Iron Sight Set, Flip Up, fits M1913 Rail, Black, SITE-SET-1913-FLIP

SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly

SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly

As Low As (Save 23%)

See all 2 models

Midwest Industries Mi Muzzle Device Collar Sig Mcx .300 Aac Models

Midwest Industries Mi Muzzle Device Collar Sig Mcx .300 Aac Models

List: $24.97 (Save 36%)

Next Level Armament NLA Sig Saure MPX/MCX 9mm Luger Barrel Adapter, Black, NLX659

Next Level Armament NLA Sig Saure MPX/MCX 9mm Luger Barrel Adapter, Black, NLX659

SIG SAUER Sig 1 Airsoft Spring Pistol

SIG SAUER Sig 1 Airsoft Spring Pistol

As Low As (Save Up to 11%)

See all 2 models

SIG SAUER Grip, PDW, Black, 2401668-01-R

SIG SAUER Grip, PDW, Black, 2401668-01-R

SIG SAUER Proforce Airsoft Pistol, Mcx Automatic Electric Gun, Black, Medium, AIR-PF-MCXAEG

SIG SAUER Proforce Airsoft Pistol, Mcx Automatic Electric Gun, Black, Medium, AIR-PF-MCXAEG

List: $509.99 (Save 12%)

SIG SAUER Barrel Clamp Screws - KIT-MCX-BARREL-CLAMP-SCREW

SIG SAUER Barrel Clamp Screws - KIT-MCX-BARREL-CLAMP-SCREW

List: $11.99 (Save 21%)

SIG SAUER Proforce MCX Series 6mm 30 Rounds Air Magazine, Dual CO2, Black, 30, AMPF-MCX-CO2-BLK

SIG SAUER Proforce MCX Series 6mm 30 Rounds Air Magazine, Dual CO2, Black, 30, AMPF-MCX-CO2-BLK

List: $65.99 (Save $4.00)

Forends/Handguards

1–5 / 5

Free 2 Day Shipping

Lancer Mcx Carbon Fiber Handguard

Lancer Mcx Carbon Fiber Handguard

As Low As (Save Up to 27%)

See all 3 models

Midwest Industries Handguard, MCX Virtus, 12.5in, M-LOK, Aluminum, Black, MIMCXV125

Midwest Industries Handguard, MCX Virtus, 12.5in, M-LOK, Aluminum, Black, MIMCXV125

List: $219.95 (Save $10.00)

Lancer Handguard Sig Mcx 12" M-lok Carbon Fiber

Lancer Handguard Sig Mcx 12" M-lok Carbon Fiber

As Low As (Save Up to 27%)

See all 2 models

SIG SAUER Hand Guard SIG MCX, Aluminum, Low Profile, Rifle, MLOK, Gray, Large, MCX-RIFLE-MLOK-GRY

List: $199.00 (Save 10%)

SIG SAUER MCX Rattler Low Profile M-LOK Handguard, 5in, 5.56mm, Aluminum, Black, HGRD-MCX-R55-MLOK-BLK

List: $199.99 (Save 22%)

Magazine and Accessories

1–3 / 3

Forward Controls Design SIG MCX Enhanced Magazine Release Button, Black, EMR-MCX

Forward Controls Design SIG MCX Enhanced Magazine Release Button, Black, EMR-MCX

SIG SAUER MCX BB Series 4.5mm 30 Rounds Air Magazine, Dual CO2, Black, 30, AMRC-BB-MCX-30

SIG SAUER MCX BB Series 4.5mm 30 Rounds Air Magazine, Dual CO2, Black, 30, AMRC-BB-MCX-30

List: $65.99 (Save $4.00)

SIG SAUER PMAG GEN 3 P556/MCX/SIG516 5.56 NATO 30 Rounds Rifle Magazine w/Window, Black, 30, 8900006

SIG SAUER PMAG GEN 3 P556/MCX/SIG516 5.56 NATO 30 Rounds Rifle Magazine w/Window, Black, 30, 8900006

List: $43.99 (Save 14%)

Gun Triggers

1–4 / 4

Triggertech SIG Sauer Adaptable Trigger

Triggertech SIG Sauer Adaptable Trigger

List: $307.44 (Save Up to 21%)

See all 2 models

Blackout Defense Sig MCX Zero Trigger

Blackout Defense Sig MCX Zero Trigger

List: $259.99 (Save $20.00)

See all 2 models

SIG SAUER Disconnect Springs, 1702350-R

SIG SAUER Disconnect Springs, 1702350-R

List: $16.99 (Save 12%)

SIG SAUER Spring, FPS, 2401437-R

SIG SAUER Spring, FPS, 2401437-R

List: $16.99 (Save 12%)

.300 AAC Blackout Ammo

1–37 / 37

Freedom Munitions .300 Blackout 147 Grain Full Metal Jacket Brass Rifle Ammunition

Freedom Munitions .300 Blackout 147 Grain Full Metal Jacket Brass Rifle Ammunition

As Low As (Save Up to 19%)

$0.61 - $0.66/Round

See all 3 models

Freedom Munitions .300 Blackout 150 Grain Full Metal Jacket Brass Rifle Ammunition

Freedom Munitions .300 Blackout 150 Grain Full Metal Jacket Brass Rifle Ammunition

As Low As (Save Up to 19%)

$0.61 - $0.67/Round

See all 3 models

Hornady Frontier .300 AAC Blackout 125 Grain Full Metal Jacket Centerfire Rifle Ammunition

Hornady Frontier .300 AAC Blackout 125 Grain Full Metal Jacket Centerfire Rifle Ammunition

As Low As (Save Up to 26%)

$1.20 - $1.41/Round

See all 3 models

Super Vel Ammunition 300 Blackout 200 grain Full Metal Jacket Brass Cased Rifle Ammunition

Super Vel Ammunition 300 Blackout 200 grain Full Metal Jacket Brass Cased Rifle Ammunition

As Low As (Save Up to 24%)

$1.07 - $1.13/Round

See all 2 models

Remington .300 AAC Blackout UMC 220 Grain Open Tip Flat Base Brass Rifle Ammunition

Remington .300 AAC Blackout UMC 220 Grain Open Tip Flat Base Brass Rifle Ammunition

As Low As (Save 23%)

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Super Vel Ammunition 300 Blackout 150 grain Full Metal Jacket Brass Cased Rifle Ammunition

Super Vel Ammunition 300 Blackout 150 grain Full Metal Jacket Brass Cased Rifle Ammunition

As Low As (Save Up to 20%)

$0.76 - $0.93/Round

See all 2 models

Atomic Ammunition Subsonic .300 AAC Blackout 220 grain Boat Tail Hollow Point Brass Cased Rifle Ammunition

Atomic Ammunition Subsonic .300 AAC Blackout 220 grain Boat Tail Hollow Point Brass Cased Rifle Ammunition

As Low As (Save Up to $3.01)

$1.67 - $1.87/Round

See all 2 models

Barnes Precision Match .300 AAC Blackout 125 grain Match Burner Open Tip Match Boat Tail Centerfire Rifle Ammunition

Barnes Precision Match .300 AAC Blackout 125 grain Match Burner Open Tip Match Boat Tail Centerfire Rifle Ammunition

As Low As (Save Up to 11%)

See all 2 models

Remington UMC Rifle .300 AAC Blackout 220 Grain Open Tip Flat Base Rifle Ammunition

Remington UMC Rifle .300 AAC Blackout 220 Grain Open Tip Flat Base Rifle Ammunition

As Low As (Save Up to 14%)

$1.80 - $1.90/Round

See all 2 models

Doubletap Ammunition Colt Defense .300 AAC Blackout, 125 grain, Solid Copper, 20 Rounds Rifle Ammo, 300BLK125CT

Doubletap Ammunition Colt Defense .300 AAC Blackout, 125 grain, Solid Copper, 20 Rounds Rifle Ammo, 300BLK125CT

List: $49.99 (Save 29%)

Hornady BLACK .300 AAC Blackout 208 Grain ELD Brass Cased Rifle Ammo, 20 Rounds, 80891

Hornady BLACK .300 AAC Blackout 208 Grain ELD Brass Cased Rifle Ammo, 20 Rounds, 80891

List: $42.92 (Save 14%)

Hornady Custom .300 AAC Blackout 135 grain Flex Tip eXpanding Brass Cased Centerfire Rifle Ammo, 20 Rounds, 80881

Hornady Custom .300 AAC Blackout 135 grain Flex Tip eXpanding Brass Cased Centerfire Rifle Ammo, 20 Rounds, 80881

List: $49.53 (Save 30%)

SinterFire Reduced Hazard .300 AAC Blackout 110 Grain Frangible Brass Cased Rifle Ammo, 50 Rounds, SF300BLK110RHA

SinterFire Reduced Hazard .300 AAC Blackout 110 Grain Frangible Brass Cased Rifle Ammo, 50 Rounds, SF300BLK110RHA

List: $50.69 (Save 12%)

Hornady Ammo Custom, .300 Blackout, 110 Grain, Centerfire Rifle Ammo, CX Polymer Tip, 20 Rounds, 808794

Hornady Ammo Custom, .300 Blackout, 110 Grain, Centerfire Rifle Ammo, CX Polymer Tip, 20 Rounds, 808794

List: $50.84 (Save 28%)

Nosler BTA Ballistic Tip Ammunition 300 Blackout 220 Grain Ballistic Tip Round Nose Brass Cased Centerfire Rifle Ammo, 20 Rounds, 61050

Nosler BTA Ballistic Tip Ammunition 300 Blackout 220 Grain Ballistic Tip Round Nose Brass Cased Centerfire Rifle Ammo, 20 Rounds, 61050

List: $54.95 (Save 18%)

Barnes Vor-TxRifle Cartridges, .300 AAC Blackout, TAC-TX Flat Base, 110 Grain, 20 - Rounds, 21548

Barnes Vor-TxRifle Cartridges, .300 AAC Blackout, TAC-TX Flat Base, 110 Grain, 20 - Rounds, 21548

List: $52.99 (Save 10%)

Underwood Ammo .300 AAC Blackout 194 Grain Solid Monolithic Hollow Point Nickel Plated Brass Cased Rifle Ammo, 20 Rounds, 452

Underwood Ammo .300 AAC Blackout 194 Grain Solid Monolithic Hollow Point Nickel Plated Brass Cased Rifle Ammo, 20 Rounds, 452

List: $112.99 (Save 35%)

Fort Scott Munitions 300AAC BLACKOUT 190 Grain Centerfire Rifle Ammo, 20 Rounds, 300-190-SCV1SS

Fort Scott Munitions 300AAC BLACKOUT 190 Grain Centerfire Rifle Ammo, 20 Rounds, 300-190-SCV1SS

List: $38.15 (Save $1.66)

Underwood Ammo .300 AAC Blackout 125 Grain Polymer Tipped Spitzer Nickel Plated Brass Cased Rifle Ammo, 20 Rounds, 418

Underwood Ammo .300 AAC Blackout 125 Grain Polymer Tipped Spitzer Nickel Plated Brass Cased Rifle Ammo, 20 Rounds, 418

List: $53.81 (Save 33%)

Lehigh Defense Maximum Expansion .300 AAC Blackout 194 grain Rifle Ammo, 20 Rounds, LA300BLK-194-ME

Lehigh Defense Maximum Expansion .300 AAC Blackout 194 grain Rifle Ammo, 20 Rounds, LA300BLK-194-ME

List: $108.69 (Save 25%)

Barnes Vor-TxRifle Cartridges, .300 AAC Blackout, TAC-TX Boat Tail , 120 Grain, 20 - Rounds, 30827

Barnes Vor-TxRifle Cartridges, .300 AAC Blackout, TAC-TX Boat Tail , 120 Grain, 20 - Rounds, 30827

List: $52.99 (Save 17%)

Hornady Frontier 300 Blackout 208 Grain FMJ Brass Cased Rifle Ammo, 20 Rounds, FR410

Hornady Frontier 300 Blackout 208 Grain FMJ Brass Cased Rifle Ammo, 20 Rounds, FR410

List: $36.25 (Save 13%)

G9 Defense 300 BLK 120 Grain Barrier Blind Hollow Point Brass Cased Rifle Ammo, 20 Rounds, B-300BLK-120

G9 Defense 300 BLK 120 Grain Barrier Blind Hollow Point Brass Cased Rifle Ammo, 20 Rounds, B-300BLK-120

List: $42.99 (Save 10%)

Underwood Ammo .300 AAC Blackout 220 Grain Hollowpoint Boat Tail Match Nickel Plated Brass Cased Rifle Ammo, 20 Rounds, 419

Underwood Ammo .300 AAC Blackout 220 Grain Hollowpoint Boat Tail Match Nickel Plated Brass Cased Rifle Ammo, 20 Rounds, 419

List: $70.58 (Save 46%)

Nosler .300 AAC Blackout, Ballistic Tip , 125 grain, Brass Cased, 20 Rounds, 61032

Nosler .300 AAC Blackout, Ballistic Tip , 125 grain, Brass Cased, 20 Rounds, 61032

List: $54.95 (Save 24%)

Wilson Combat Sierra .300 AAC Blackout 220 Grain Hollow Point Boat Tail Brass Cased Pistol Ammo, 20 Round, A300BLK-220-HPBT-20RD

Wilson Combat Sierra .300 AAC Blackout 220 Grain Hollow Point Boat Tail Brass Cased Pistol Ammo, 20 Round, A300BLK-220-HPBT-20RD

List: $44.95 (Save 14%)

Federal Premium Power-Shok Copper .300 AAC Blackout 120 Grain Copper Hollow Point Rifle Ammo, 20 Rounds, 300BLK120LFA

Federal Premium Power-Shok Copper .300 AAC Blackout 120 Grain Copper Hollow Point Rifle Ammo, 20 Rounds, 300BLK120LFA

Price After Rebate

Wilson Combat Hornady V-MAX .300 AAC Blackout 110 Grain Brass Cased Pistol Ammo, 20 Round, A300BLK-110-VMAX-20RD

Wilson Combat Hornady V-MAX .300 AAC Blackout 110 Grain Brass Cased Pistol Ammo, 20 Round, A300BLK-110-VMAX-20RD

List: $62.59 (Save 41%)

Winchester Super Suppressed .300 AAC Blackout 200 grain Full Metal Jacket Centerfire Rifle Ammo, 20 Rounds, SUP300BLK

Winchester Super Suppressed .300 AAC Blackout 200 grain Full Metal Jacket Centerfire Rifle Ammo, 20 Rounds, SUP300BLK

List: $34.99 (Save 40%)

Freedom Munitions HUSH Subsonic .300 Blackout 220 Grain HPBT Brass Rifle Ammo, 50 Rounds, FMH300H220N50

Freedom Munitions HUSH Subsonic .300 Blackout 220 Grain HPBT Brass Rifle Ammo, 50 Rounds, FMH300H220N50

List: $63.19 (Save 12%)

Veteran Ammo Defense .300 AAC Blackout 110 Grain Hollow Point Brass Cased Centerfire Pistol Ammo, 20 Rounds, HMBX-300-26

Veteran Ammo Defense .300 AAC Blackout 110 Grain Hollow Point Brass Cased Centerfire Pistol Ammo, 20 Rounds, HMBX-300-26

List: $53.49 (Save 22%)

Hornady Subsonic .300 AAC Blackout 190 grain Subsonic eXpanding Brass Cased Centerfire Rifle Ammo, 20 Rounds, 80877

Hornady Subsonic .300 AAC Blackout 190 grain Subsonic eXpanding Brass Cased Centerfire Rifle Ammo, 20 Rounds, 80877

List: $44.80 (Save 16%)

Veteran Ammo Defense .300 AAC Blackout 200 grain Hollow Point Brass Cased Centerfire Pistol Ammo, 20 Rounds, HMBX-300-27

Veteran Ammo Defense .300 AAC Blackout 200 grain Hollow Point Brass Cased Centerfire Pistol Ammo, 20 Rounds, HMBX-300-27

List: $59.99 (Save 18%)

Hornady BLACK .300 AAC Blackout 110 grain V-MAX Brass Cased Centerfire Rifle Ammo, 20 Rounds, 80873

Hornady BLACK .300 AAC Blackout 110 grain V-MAX Brass Cased Centerfire Rifle Ammo, 20 Rounds, 80873

List: $42.47 (Save 18%)

Sellier & Bellot Subsonic .300 AAC Blackout 200 grain Full Metal Jacket Brass Cased Rifle Ammo, 20 Rounds, SB300BLKSUBA

Sellier & Bellot Subsonic .300 AAC Blackout 200 grain Full Metal Jacket Brass Cased Rifle Ammo, 20 Rounds, SB300BLKSUBA

List: $20.46 (Save $1.47)

Freedom Munitions .300 Blackout 125 Grain Full Metal Jacket Brass Rifle Ammo, 50 Rounds, FM300F125N50

Freedom Munitions .300 Blackout 125 Grain Full Metal Jacket Brass Rifle Ammo, 50 Rounds, FM300F125N50

List: $37.19 (Save 11%)

SIG SAUER .300 AAC Blackout 220 Grain Match Brass Cased Rifle Ammo, 20 Rounds, C300A2-20

SIG SAUER .300 AAC Blackout 220 Grain Match Brass Cased Rifle Ammo, 20 Rounds, C300A2-20

List: $32.99 (Save $3.00)

7.62x39mm Ammo

1–9 / 9

Hornady Frontier 7.62x39mm 123 Grain Full Metal Jacket Brass Cased Rifle Ammunition

Hornady Frontier 7.62x39mm 123 Grain Full Metal Jacket Brass Cased Rifle Ammunition

As Low As (Save Up to 28%)

$1.16 - $1.17/Round

See all 2 models

Atomic Ammunition Tactical Cycling Subsonic 7.62x39mm 220 grain Boat Tail Hollow Point Brass Cased Rifle Ammunition

Atomic Ammunition Tactical Cycling Subsonic 7.62x39mm 220 grain Boat Tail Hollow Point Brass Cased Rifle Ammunition

As Low As (Save Up to $4.00)

$1.97 - $2.20/Round

See all 2 models

Hornady BLACK 7.62x39 mm 123 grain Super Shock Tip Brass Cased Centerfire Rifle Ammo, 20 Rounds, 80784

Hornady BLACK 7.62x39 mm 123 grain Super Shock Tip Brass Cased Centerfire Rifle Ammo, 20 Rounds, 80784

List: $45.40 (Save 29%)

Hornady Subsonic 7.62x39 255 Grain Sub X Brass Riffle Ammo, 20 Rounds, 80787

Hornady Subsonic 7.62x39 255 Grain Sub X Brass Riffle Ammo, 20 Rounds, 80787

List: $47.71 (Save 12%)

PMC 762A Bronze 7.62x39mm 123 Gr Full Metal Jacket FMJ - 20 Rounds

PMC 762A Bronze 7.62x39mm 123 Gr Full Metal Jacket FMJ - 20 Rounds

List: $22.99 (Save 13%)

DoubleTap Ammunition Lead Free, 7.62X39, 123Gr, Solid Copper Hollow Point, 20 Round Box, CA Certified Nonlead Ammunition 739123X

DoubleTap Ammunition Lead Free, 7.62X39, 123Gr, Solid Copper Hollow Point, 20 Round Box, CA Certified Nonlead Ammunition 739123X

List: $58.00 (Save $3.81)

Nosler VMA 7.62x39mm 123 Grain Flat Base Tipped Varmageddon Brass Cased Centerfire Rifle Ammo, 20 Rounds, 60176

Nosler VMA 7.62x39mm 123 Grain Flat Base Tipped Varmageddon Brass Cased Centerfire Rifle Ammo, 20 Rounds, 60176

List: $38.95 (Save 23%)

PPU 7.62x39mm 0 grain Brass Cased Blank Ammo, 15 Rounds, PPB739

PPU 7.62x39mm 0 grain Brass Cased Blank Ammo, 15 Rounds, PPB739

List: $19.99 (Save 25%)

Sellier & Bellot 7.62x39mm 124 Grain FMJ Brass Cased Rifle Ammo, 20 Rounds, SB76239A

Sellier & Bellot 7.62x39mm 124 Grain FMJ Brass Cased Rifle Ammo, 20 Rounds, SB76239A

List: $18.99 (Save 13%)

Image of SIG SAUER MCX AR-15 5.56x45mm NATO Caliber Exchange Kit

2 models SIG SAUER MCX AR-15 5.56x45mm NATO Caliber Exchange Kit As Low As (Save Up to 23%) $769.99 Free 2 Day Shipping

Image of SIG SAUER Sig MPX Minimalist Plus Folding Stock

SIG SAUER Sig MPX Minimalist Plus Folding Stock (12) List: $249.99 (Save 16%) $209.99 Best Rated

Image of SIG SAUER Sig MPX Minimalist Plus Folding Stock

SIG SAUER Sig MPX Minimalist Plus Folding Stock (12) List: $249.99 (Save 16%) $209.99 Best Rated

Image of SIG SAUER Pro P320 9mm Full Size XRAY3 Sights Barrel Assembly

SIG SAUER Pro P320 9mm Full Size XRAY3 Sights Barrel Assembly (7) List: $799.99 (Save 18%) $658.89 Best Rated

Image of SIG SAUER P365/P365X/P365XL 9mm Corrosion-Resistant Pistol Slide Completion Kit w/Extractors&Strikers

SIG SAUER P365/P365X/P365XL 9mm Corrosion-Resistant Pistol Slide Completion Kit w/Extractors&Strikers (11) List: $99.99 (Save $7.20) $92.79 Best Rated

Image of SIG SAUER Flip Up Iron Sight Set

SIG SAUER Flip Up Iron Sight Set (67) List: $166.93 $152.49 Best Rated

Image of SIG SAUER Flip Up Iron Sight Set

SIG SAUER Flip Up Iron Sight Set (67) List: $166.93 $152.49 Best Rated

Image of SIG SAUER Flip Up Iron Sight Set

SIG SAUER Flip Up Iron Sight Set (67) List: $166.93 $152.49 Best Rated

Image of SIG SAUER P365 X-Macro 9/380 Grip Standard Module

SIG SAUER P365 X-Macro 9/380 Grip Standard Module (40) List: $99.99 $93.99 Best Rated

Image of SIG SAUER P229 Barrel, .357SIG, Blued

SIG SAUER P229 Barrel, .357SIG, Blued (22) List: $179.99 (Save 13%) $156.89 Best Rated

Image of SIG SAUER P320 Compact/Carry Threaded Pistol Barrel, 9mm Luger

SIG SAUER P320 Compact/Carry Threaded Pistol Barrel, 9mm Luger (6) List: $229.99 (Save 12%) $203.49

Image of SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly

2 models SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly As Low As (Save 23%) $1,149.00 On Sale

Image of SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly

2 models SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly As Low As (Save 23%) $1,149.00 On Sale

Image of SIG SAUER Recoil Spring Assembly for P365 w/ 3.1in Barrel

SIG SAUER Recoil Spring Assembly for P365 w/ 3.1in Barrel (10) List: $45.99 (Save 24%) $34.99 Best Rated

Image of SIG SAUER MCX/MPXMinimalist Locking Folding Rifle Stock

SIG SAUER MCX/MPXMinimalist Locking Folding Rifle Stock List: $249.99 (Save 15%) $212.49

Image of SIG SAUER MCX/MPXMinimalist Locking Folding Rifle Stock

SIG SAUER MCX/MPXMinimalist Locking Folding Rifle Stock List: $249.99 (Save 15%) $212.49

Image of SIG SAUER P365-XMacro Compact 9mm Caliber X-Change Kit

SIG SAUER P365-XMacro Compact 9mm Caliber X-Change Kit List: $619.99 (Save 12%) $547.99

Image of SIG SAUER P226 9 mm Chrome Phosphate Threaded Barrel

SIG SAUER P226 9 mm Chrome Phosphate Threaded Barrel (18) List: $229.99 (Save 22%) $179.99 Blazin' Deal

Image of SIG SAUER P320 9 mm 5.5in Pistol Barrels - Threaded

SIG SAUER P320 9 mm 5.5in Pistol Barrels - Threaded (16) List: $229.99 (Save 15%) $196.49

Image of SIG SAUER P229-1 9mm Luger Threaded Barrel

SIG SAUER P229-1 9mm Luger Threaded Barrel (19) List: $229.99 (Save 22%) $179.99 Blazin' Deal

Image of SIG SAUER Pro-Cut Slide Assembly P320 Sub-Compact/XCompact/X-Full 3.6in 9mm Luger Pistol Slide

8 models SIG SAUER Pro-Cut Slide Assembly P320 Sub-Compact/XCompact/X-Full 3.6in 9mm Luger Pistol Slide (9) As Low As (Save Up to 21%) $355.99 Free 2 Day Shipping

Image of SIG SAUER Stock Adapter - 1913 Interface Folding Knuckle

SIG SAUER Stock Adapter - 1913 Interface Folding Knuckle (34) List: $129.99 $110.99 Best Rated

Image of SIG SAUER Stock Adapter - 1913 Interface Folding Knuckle

SIG SAUER Stock Adapter - 1913 Interface Folding Knuckle (34) List: $129.99 $110.99 Best Rated

Image of SIG SAUER Stock Adapter - 1913 Interface Folding Knuckle

SIG SAUER Stock Adapter - 1913 Interface Folding Knuckle (34) List: $129.99 $110.99 Best Rated

SIG SAUER Upper Mcx Unavailable & Discontinued Models

List of Unorderable Models

SIG SAUER Upper Mcx - WUAMCX-5B-300B-BLK-TAP , MPN: WUAMCX-5B-300B-BLK-TAP , UPC: 798681586295 , Code: SD9-UFH-EC649BFA-WUAMCX-5B-300B-BLK-TAP

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SIG SAUER + Gun Parts Sig Sauer Gun Parts SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + AR 15 Parts Sig Sauer AR15 Parts + AR15 Upper Receivers Sig Sauer AR15 Upper Receivers SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + Rifle Parts Sig Sauer Rifle Parts + AR 15 Parts Sig Sauer AR15 Parts + AR15 Upper Receivers Sig Sauer AR15 Upper Receivers SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + AR 15 Parts Sig Sauer AR15 Parts SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + Rifle Parts Sig Sauer Rifle Parts + AR 15 Parts Sig Sauer AR15 Parts SIG SAUER Upper Mcx SIG SAUER + Gun Parts Sig Sauer Gun Parts + Rifle Parts Sig Sauer Rifle Parts SIG SAUER Upper Mcx

Last updated 2026-10-02 UTC.