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SIG SAUER MPX Caliber X-Change Kit

EDEMO DEMO, SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2, EDEMO1
SIG SAUER Sig MPX Gen 1 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G1
SIG SAUER Sig MPX Gen 1 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G1
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 16 in, CALX-MPX-16B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 8 in, CALX-MPX-8B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
EDEMO DEMO, SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2, EDEMO1
1 of 12 images
EDEMO DEMO, SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2, EDEMO1
SIG SAUER Sig MPX Gen 1 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G1
2 of 12 images
SIG SAUER Sig MPX Gen 1 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G1
SIG SAUER Sig MPX Gen 1 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G1
3 of 12 images
SIG SAUER Sig MPX Gen 1 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G1
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 16 in, CALX-MPX-16B-9-G2
4 of 12 images
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 16 in, CALX-MPX-16B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 8 in, CALX-MPX-8B-9-G2
5 of 12 images
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 8 in, CALX-MPX-8B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
6 of 12 images
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2
7 of 12 images
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
8 of 12 images
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
9 of 12 images
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
10 of 12 images
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
11 of 12 images
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2
12 of 12 images
SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2

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Questions & Answers
Will this work with gen 3 MPX K model with mlok? Expert Answer

The SIG SAUER MPX Caliber X-Change Kit will work on a Gen 3 MPX K.

by Hunter, Gear Expert, August 11, 2023
What is this changing the caliber to? I’ve only seen 9mm MPX’s. Or is this just a barrel exchange & caliber stays the same?

barrel exchange

by pat, Verified Owner, April 16, 2018
View All Q&A You Have a Question? Ask!
Customer Reviews
Most Recent Reviews
Excellent nail driver by Dan, Verified Owner, February 4, 2022
Swapped out the 4.5" on my MPX K. This is a quality upgrade giving your hand a little more room to spread out on a longer handguard. I don't plan to suppress and this thing is is a naildriver. If you can find one, get it
Most Recent Reviews
Outstanding by Kmh, October 9, 2019
Quality Sig part, easy swap with 16” PCC barrel. Bought it, along with a Midwest industries handguard, to convert a PCC to an SBR, works flawlessly. No appreciable loss in accuracy due to the shorter barrel and still runs smooth
Read All 2 Reviews

Code: SD9-CNC-MPXCX-CALX-MPX-6B-9-G2-EDEMO-OT-D-0RD

MPN: CALX-MPX-6B-9-G2-DEMO-EDEMO1-EDEMO1

Product No Longer Available

Product Info for SIG SAUER MPX Caliber X-Change Kit

This is a 6" barrel for the Second Generation of the MPX Platform.image

Package Contents:

  • SIG SAUER MPX Caliber X-Change Kit

Gun Parts and Accessories

1–22 / 22
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Strike Industries Dual Folding Adapter Stabilizer, Black, One Size, SI-FSA-DUAL-STAB
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(91)
List: $197.95 (Save $10.00)
$187.95
13% Coupon
DFCO Kung Fu Grip, Black
DFCO Kung Fu Grip, Black
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Radian Weapons Raptor-LT Charging Handle, SIG MPX, Black, R0367
Radian Weapons Raptor-LT Charging Handle, SIG MPX, Black, R0367
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$104.95
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SIG SAUER Fixed/Folding Pivoting Contour Brace w/ Locking Hinge
SIG SAUER Fixed/Folding Pivoting Contour Brace w/ Locking Hinge
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13% Coupon
Dead Foot Arms Telescoping Adaptor for Tailhook Mod 1
Dead Foot Arms Telescoping Adaptor for Tailhook Mod 1
As Low As (Save Up to 20%)
$131.99
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Taran Tactical Innovations MPX Magwell, Gen 3, Flat Black, 0, MPX9-MW0-G3
Taran Tactical Innovations MPX Magwell, Gen 3, Flat Black, 0, MPX9-MW0-G3
(4)
List: $99.99 (Save 20%)
$79.99
Reptilia Puller MPX Charging Handle
Reptilia Puller MPX Charging Handle
List: $104.95 (Save 10%)
$94.46
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KNS Precision Galil-Picatinny Stock Adapter, Black, Galil-Picatinny St Adap
KNS Precision Galil-Picatinny Stock Adapter, Black, Galil-Picatinny St Adap
(4)
List: $45.00
$44.99
13% Coupon
Stark Equipment MPX Rifle Grip
Stark Equipment MPX Rifle Grip
As Low As (Save Up to $3.00)
$32.99
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On Sale
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%)
$143.49
LANTAC MPX 13.5mm Crush Washer, Black, 01-PP-1351-CRW
LANTAC MPX 13.5mm Crush Washer, Black, 01-PP-1351-CRW
List: $6.99 (Save 10%)
$6.30
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Maglula Lula Loader & Unloader, Black - LU19B
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Timney Triggers SIG MPX Curved Trigger
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Blazin' Deal
Next Level Armament NLA Sig Sauer MPX Rifle Charging Handle w/ Block Kit, Black, NLX702
Next Level Armament NLA Sig Sauer MPX Rifle Charging Handle w/ Block Kit, Black, NLX702
(19)
List: $115.00 (Save 10%)
$103.55
Free 2 Day Shipping
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
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List: $179.95 (Save $10.00)
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Next Level Armament NLA Sig Sauer MPX Lifter Block Rifle Charging Handle, Black, NLX651
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(10)
List: $57.00 (Save $4.00)
$53.00
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SB Tactical MPX Pistol Stabilizing Brace, Black MPX-01-SB
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(117)
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HIPERFIRE Xtreme 2 Stage Mod-3 AR15/10 Trigger Assembly
HIPERFIRE Xtreme 2 Stage Mod-3 AR15/10 Trigger Assembly
(4)
List: $225.00 (Save 15%)
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HIPERFIRE Xtreme 2 Stage Mod-2 AR15/10 Trigger Assembly
HIPERFIRE Xtreme 2 Stage Mod-2 AR15/10 Trigger Assembly
(2)
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SIG SAUER MPX PCC 9mm Caliber Exchange Kit, 16in, 8900237
SIG SAUER MPX PCC 9mm Caliber Exchange Kit, 16in, 8900237
List: $869.99 (Save 15%)
$739.99
13% Coupon
HIPERFIRE Xtreme 2 Stage Mod-1 AR15/10 Trigger Assembly
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(5)
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Next Level Armament NLA Sig Sauer MPX Rifle Charging Handle, Black, NLX707
Next Level Armament NLA Sig Sauer MPX Rifle Charging Handle, Black, NLX707
(1)
List: $80.00 (Save $7.00)
$73.00
Next

Forends/Handguards

1–4 / 4
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Midwest Industries Mpx Handguard M-lok, Black - MI-MPX80M
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(16)
List: $173.95 (Save $11.00)
$162.95
Free 2 Day Shipping
Lancer Systems SIG MPX Carbon SIG Sauer MPX M-LOK Handguard
Lancer Systems SIG MPX Carbon SIG Sauer MPX M-LOK Handguard
(22)
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Lancer Systems SIG MPX Carbon Handguard
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(2)
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AIM Sports Inc M-LOK 12.76in Drop-In Specialty Handguard for SIG MPX, Black, Medium, MTMPXM, Black, Medium, MTMPXM
AIM Sports Inc M-LOK 12.76in Drop-In Specialty Handguard for SIG MPX, Black, Medium, MTMPXM, Black, Medium, MTMPXM
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Gun Stocks

1–10 / 10
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SIG SAUER Stock Adapter - 1913 Interface Folding Knuckle, SIG MCX / SIG MPX, Black, ADAPTER-X-FOLD
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SIG SAUER MCX/MPX Visor Folding Rifle Stock, Black, 8901412
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Samson The S.A.S II Tactical Folding Stock, Black, 04-06141-01
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A3 Industries Universal Picatinny Mount - Modular Telescoping Stock
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SIG SAUER MCX/MPX Minimalist Plus Locking Folding Rifle Stock, Black, 8901411
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(1)
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$212.49
SIG SAUER MCX/MPXMinimalist Locking Folding Rifle Stock, Black, 8901410
SIG SAUER MCX/MPXMinimalist Locking Folding Rifle Stock, Black, 8901410
List: $249.99 (Save 14%)
$215.49
SIG SAUER MCX/MPX Folding Rifle Stock, Coyote, 8901458
SIG SAUER MCX/MPX Folding Rifle Stock, Coyote, 8901458
(2)
List: $249.99 (Save 16%)
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Newly Added
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%)
$269.99
SIG SAUER MCX/MPX Folding Rifle Stock, Black, STOCK-X-FOLD-CTR-BLK
SIG SAUER MCX/MPX Folding Rifle Stock, Black, STOCK-X-FOLD-CTR-BLK
(2)
List: $199.00 (Save 10%)
$179.99
Next

SIG SAUER MPX Caliber X-Change Kit Accessories

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SIG SAUER Electro-Optics SOF2R100 Foxtrot2 Black Anodized, SOF2R100
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(19)
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$149.99
SIG SAUER SIG SAUER MCX And MPX Air Rifle Magazine, 30-Rounds, AMRC-177-30
SIG SAUER SIG SAUER MCX And MPX Air Rifle Magazine, 30-Rounds, AMRC-177-30
(2)
List: $39.99 (Save $3.10)
$36.89
SIG SAUER Grip, PDW, Black, 2401668-01-R
SIG SAUER Grip, PDW, Black, 2401668-01-R
(1)
$35.99
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Gun Triggers

1–4 / 4
Previous
13% Coupon
Triggertech Adaptable Sig MPX Two-Stage Trigger
Triggertech Adaptable Sig MPX Two-Stage Trigger
(4)
List: $307.44 (Save Up to 19%)
$294.99
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Best Rated
Timney Triggers SIG MPX Straight Trigger, 4.5lb Pull Weight, Black, 683
Timney Triggers SIG MPX Straight Trigger, 4.5lb Pull Weight, Black, 683
(21)
List: $267.99 (Save 20%)
$215.49
Best Rated
Geissele MPX M4 Rifle Trigger, Sig Sauer MPX, M4 Curve, 2.75 - 3 lb Pull, 16-025
Geissele MPX M4 Rifle Trigger, Sig Sauer MPX, M4 Curve, 2.75 - 3 lb Pull, 16-025
(5)
$360.00
SIG SAUER Trigger, Timney, MPX Single Stage, 1811266-R
SIG SAUER Trigger, Timney, MPX Single Stage, 1811266-R
List: $280.99 (Save $11.00)
$269.99
Next

Magazine and Accessories

1–11 / 11
Previous
Best Rated
Lancer Systems Mpx X-cinch Mag Coupler - MPX-CINCH
Lancer Systems Mpx X-cinch Mag Coupler - MPX-CINCH
(11)
List: $26.99 (Save 22%)
$20.99
Ghost Inc Ghost MOAB SIG MPX Baseplates, SIG Sauer MPX 9mm, All Gens, 3 Pack, Black, GHOMPXMOABBLK
Ghost Inc Ghost MOAB SIG MPX Baseplates, SIG Sauer MPX 9mm, All Gens, 3 Pack, Black, GHOMPXMOABBLK
(2)
List: $24.97 (Save 40%)
$14.99
ProMag Pistol Magazine, Sig Sauer Sig MPX, 9mm Luger, 30 Round, Black, 1 Pack, DuPont Zytel Polymer, DRMA36-30RD
ProMag Pistol Magazine, Sig Sauer Sig MPX, 9mm Luger, 30 Round, Black, 1 Pack, DuPont Zytel Polymer, DRMA36-30RD
List: $117.99 (Save 21%)
$92.79
ProMag Pistol Magazine, Sig Sauer Sig MPX, 9mm Luger, 50 Round, Black, 1 Pack, DuPont Zytel Polymer, DRMA21-50RD
ProMag Pistol Magazine, Sig Sauer Sig MPX, 9mm Luger, 50 Round, Black, 1 Pack, DuPont Zytel Polymer, DRMA21-50RD
(1)
List: $129.99 (Save 26%)
$95.99
ProMag Sig Sauer MPX 9mm 40 Rounds Pistol Magazine, Black, 40, SIGA24
ProMag Sig Sauer MPX 9mm 40 Rounds Pistol Magazine, Black, 40, SIGA24
List: $39.49 (Save 19%)
$31.99
Blazin' Deal
Taran Tactical Innovations MPX THRiL Completed Rifle Magazine
Taran Tactical Innovations MPX THRiL Completed Rifle Magazine
(2)
As Low As (Save 20%)
$70.39
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SIG SAUER MPX 9mm Luger Pistol Magazine, 35 Round, Black, 1 Pack, Polymer, 8901025-35RD
SIG SAUER MPX 9mm Luger Pistol Magazine, 35 Round, Black, 1 Pack, Polymer, 8901025-35RD
(4)
List: $74.99 (Save 23%)
$57.99
Comp-Tac PCC PLM Magazine Pouch
Comp-Tac PCC PLM Magazine Pouch
(1)
As Low As (Save Up to 12%)
$41.89
See all 8 models
SIG SAUER MPX Gen 1 9mm 20 Round Pistol Magazine
SIG SAUER MPX Gen 1 9mm 20 Round Pistol Magazine
As Low As (Save Up to 10%)
$71.99
See all 2 models
SIG SAUER MPX 9mm Luger 20 Round Pistol Magazine, Black, 1 Pack, Polymer, 8900828-20RD
SIG SAUER MPX 9mm Luger 20 Round Pistol Magazine, Black, 1 Pack, Polymer, 8900828-20RD
(1)
List: $71.70 (Save 19%)
$57.79
SIG SAUER Magazine SIGMPX 9 mm 10RD, for gen 2 models MAGMPX910KM-10RD
SIG SAUER Magazine SIGMPX 9 mm 10RD, for gen 2 models MAGMPX910KM-10RD
(3)
$68.99
Next

Gun Barrels

1–4 / 4
Previous
13% Coupon
Infinite Product Solutions M13.5 x 1 LH - 1/2-28 Thread Adapter
Infinite Product Solutions M13.5 x 1 LH - 1/2-28 Thread Adapter
(2)
$39.99
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Strike Industries X-Comp Thread Adapter Kit
Strike Industries X-Comp Thread Adapter Kit
List: $25.49 (Save Up to 37%)
$17.99
See all 3 models
Midwest Industries Sig Muzzle Device Collar For Mpx 9mm Models, Black - MI-MPX9MMS
Midwest Industries Sig Muzzle Device Collar For Mpx 9mm Models, Black - MI-MPX9MMS
(1)
List: $22.94 (Save 48%)
$11.99
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
(6)
List: $11.00
$10.99
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SIG SAUER MPX Caliber X-Change Kit Unavailable & Discontinued Models

List of Unorderable Models

  • USED EDEMO DEMO, SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2, EDEMO1, EDEMO1, Condition Fair, Other , MPN: CALX-MPX-6B-9-G2-DEMO-EDEMO1-EDEMO1 , Code: SD9-CNC-MPXCX-CALX-MPX-6B-9-G2-EDEMO-OT-D-0RD
  • SIG SAUER Sig MPX Gen 1 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G1 , MPN: CALX-MPX-4B-9-G1 , UPC: 798681554317 , Code: SD9-CNC-MPXCX-CALX-MPX-4B-9-G1
  • SIG SAUER Sig MPX Gen 1 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G1 , MPN: CALX-MPX-6B-9-G1 , UPC: 798681555079 , Code: SD9-CNC-MPXCX-CALX-MPX-6B-9-G1
  • SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 16 in, CALX-MPX-16B-9-G2 , MPN: CALX-MPX-16B-9-G2 , UPC: 798681555055 , Code: SD9-CNC-MPXCX-CALX-MPX-16B-9-G2
  • DEMO, SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2 , MPN: CALX-MPX-4B-9-G2-DEMO , Code: SD9-CNC-MPXCX-CALX-MPX-4B-9-G2-0RD-DEMO
  • DEMO, SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2 , MPN: CALX-MPX-6B-9-G2-DEMO , Code: SD9-CNC-MPXCX-CALX-MPX-6B-9-G2-DEMO-0RD
  • DEMO, SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2 , MPN: CALX-MPX-6B-9-G2-DEMO , Code: SD9-CNC-MPXCX-CALX-MPX-6B-9-G2-0RD-DEMO
  • SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2 , MPN: CALX-MPX-4B-9-G2 , UPC: 798681555062 , Code: SD9-CNC-MPXCX-CALX-MPX-4B-9-G2-0RD
  • SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 8 in, CALX-MPX-8B-9-G2 , MPN: CALX-MPX-8B-9-G2 , UPC: 798681555109 , Code: SD9-CNC-MPXCX-CALX-MPX-8B-9-G2
  • SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 6.5 in, CALX-MPX-6B-9-G2 , MPN: CALX-MPX-6B-9-G2 , UPC: 798681555086 , Code: SD9-CNC-MPXCX-CALX-MPX-6B-9-G2-0RD
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Last updated 2026-09-20 UTC.