+1-800-504-5897 Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

Windham Weaponry R18FSFSM Semi-Auto Rifle, 7.62x51mm NATO, 18 in barrel Info, Compatible Parts & Accessories

Windham Weaponry R18FSFSM Semi-Auto Rifle, 7.62x51mm NATO, 18 in barrel, 1-10 Twist, A2 Flash Suppressor, 20 Rounds, R18FSFSM308-FRRMPG
Windham Weaponry R18FSFSM Semi-Auto Rifle, 7.62x51mm NATO, 18 in barrel, 1-10 Twist, A2 Flash Suppressor, 20 Rounds, R18FSFSM308-FRRMPG
1 of 1 images
Windham Weaponry R18FSFSM Semi-Auto Rifle, 7.62x51mm NATO, 18 in barrel, 1-10 Twist, A2 Flash Suppressor, 20 Rounds, R18FSFSM308-FRRMPG

Tap Tap to Zoom

Questions & Answers
Shop Accessories

This page is for information purpose only

Opticsplanet, Inc. does not sell firearms and does not have a Federal Firearms License (FFL).

Product Info for Windham Weaponry R18FSFSM Semi-Auto Rifle, 7.62x51mm NATO, 18 in barrel

Windham Weaponry R18FSFSM308 R18FSFSM 7.62x51mm NATO Caliber with 18" Barrel, 20+1 Capacity, Black Hard Coat Anodized Metal Finish, Black Fixed Magpul MOE Stock & Hogue Overmolded Grip Right Handimage

Specifications for Windham Weaponry R18FSFSM Semi-Auto Rifle, 7.62x51mm NATO, 18 in barrel:

Manufacturer: Windham Weaponry
Gun Model: Windham Weaponry R18FSFSM
Gun Type: Rifle
Caliber: 7.62x51mm NATO
Barrel Length: 18 in
Fabric/Material: 7075-T6 Aluminum
Action Type: Gas Operated Semi-Automatic
Barrel Twist Rate: 1-10
Muzzle Device: A2 Flash Hider
Magazine Capacity: 20 Round
Height: 4 in
Width: 12 in
Length: 49.3
Hand: Right

Firearm Case

1–40 / 40
Previous
On Sale
Voodoo Tactical 42in Padded Weapons Case w/Die Cut MOLLE
Voodoo Tactical 42in Padded Weapons Case w/Die Cut MOLLE
(3)
As Low As (Save Up to 47%)
$113.99
See all 12 models
On Sale
Voodoo Tactical OPMOD Double Rifle Weapons Case, 42 in, 42 in, Coyote/Black, OP-7619061000
Voodoo Tactical OPMOD Double Rifle Weapons Case, 42 in, 42 in, Coyote/Black, OP-7619061000
(6)
List: $214.99 (Save 47%)
$113.99
Best Rated
Savior Equipment Ultimate Guitar Single Rifle Case
Savior Equipment Ultimate Guitar Single Rifle Case
(31)
List: $229.97 (Save 13%)
$199.97
See all 3 models
On Sale
MTM Tactical 39in Rifle Crate, Dark Earth, TRC39
MTM Tactical 39in Rifle Crate, Dark Earth, TRC39
(4)
List: $119.99 (Save 25%)
$89.79
Best Rated
Eberlestock Sniper Sled Drag Bag Gun Case
Eberlestock Sniper Sled Drag Bag Gun Case
(11)
List: $380.00 (Save Up to $11.00)
$369.00
See all 5 models
Ulfhednar Gun Case w/backpack straps 140 cm, NSN N, UH040
Ulfhednar Gun Case w/backpack straps 140 cm, NSN N, UH040
(2)
$498.00
Best Rated
Pelican Vault V730 Tactical Rifle Case wl/wf, 47.1in
Pelican Vault V730 Tactical Rifle Case wl/wf, 47.1in
(18)
List: $261.20 (Save 20%)
$209.95
See all 2 models
Ulfhednar Gun Case w/Backpack Straps
Ulfhednar Gun Case w/Backpack Straps
(4)
As Low As (Save Up to $35.20)
$398.00
See all 2 models
Best Rated
Pelican VAULT V700 Case, Takedown Firearms, 39.61in, Black, VCV700-0000-BLK
Pelican VAULT V700 Case, Takedown Firearms, 39.61in, Black, VCV700-0000-BLK
(12)
List: $221.00 (Save 23%)
$169.95
Best Rated
Pelican VAULT V800 Double Rifle Case, 56.11in
Pelican VAULT V800 Double Rifle Case, 56.11in
(30)
List: $282.00 (Save Up to 21%)
$229.95
See all 2 models
Ulfhednar Gun Case/Shooting Mat Combo, Cordura Material, UH041
Ulfhednar Gun Case/Shooting Mat Combo, Cordura Material, UH041
List: $632.69 (Save $34.69)
$598.00
Best Rated
Savior Equipment Specialist Covert Single Rifle Case
Savior Equipment Specialist Covert Single Rifle Case
(49)
As Low As (Save Up to 17%)
$94.97
See all 12 models
Nanuk 990 Hard Gun Case w/ Foam Insert for AR, 47.1in
Nanuk 990 Hard Gun Case w/ Foam Insert for AR, 47.1in
(3)
List: $489.99 (Save $30.04)
$459.95
See all 2 models
Boyt Harness H41XD Tactical Rifle/Carbine Case, 41in, Black, 40149
Boyt Harness H41XD Tactical Rifle/Carbine Case, 41in, Black, 40149
(1)
List: $278.00 (Save 33%)
$186.49
Geissele Shootout Bag
Geissele Shootout Bag
(1)
List: $99.00
$98.49
See all 3 models
Blazin' Deal
Vertx VTAC Rifle Scabbard, It's Black, One Size, F1 VTX5708 IBK NA
Vertx VTAC Rifle Scabbard, It's Black, One Size, F1 VTX5708 IBK NA
(1)
List: $164.99 (Save 24%)
$125.99
Blazin' Deal
Nanuk 995 Double Rifle Case
Nanuk 995 Double Rifle Case
(13)
As Low As (Save Up to 70%)
$131.49
See all 7 models
Best Rated
Savior Equipment Urban Warfare Double Rifle Case
Savior Equipment Urban Warfare Double Rifle Case
(54)
As Low As (Save Up to 15%)
$94.97
See all 20 models
Nanuk 985 Hard Gun Case w/Foam AR, 39.7in
Nanuk 985 Hard Gun Case w/Foam AR, 39.7in
(2)
List: $399.99 (Save Up to $16.30)
$394.95
See all 2 models
On Sale
Boyt Harness Double Gun Case, OD Green, 52in, 0GC21DG09
Boyt Harness Double Gun Case, OD Green, 52in, 0GC21DG09
(2)
List: $165.00 (Save 31%)
$113.79
Free 2 Day Shipping
Armageddon Gear Precision Rifle Case
Armageddon Gear Precision Rifle Case
(10)
As Low As (Save Up to $7.24)
$253.40
See all 9 models
Best Rated
Eylar Extra Large 53in Waterproof Roller Hard Rifle Case w/Foam
Eylar Extra Large 53in Waterproof Roller Hard Rifle Case w/Foam
(10)
List: $399.99 (Save 44%)
$224.99
See all 6 models
Plano Element Gun Eqpmnt Case 44 in Double Tact Gun w/Gray Accent, Black, PLAM9440
Plano Element Gun Eqpmnt Case 44 in Double Tact Gun w/Gray Accent, Black, PLAM9440
List: $299.99 (Save 22%)
$233.89
Boyt Harness Rifle Case
Boyt Harness Rifle Case
(2)
As Low As (Save Up to 44%)
$132.99
See all 3 models
On Sale
Bulldog Cases & Vaults Ultra Compact AR-15 29in Discreet Carry Case, Black BD476
Bulldog Cases & Vaults Ultra Compact AR-15 29in Discreet Carry Case, Black BD476
(8)
List: $60.99 (Save 22%)
$47.87
Best Rated
Pelican Storm Cases iM3100 Long Hard Gun Case, 39.8in
Pelican Storm Cases iM3100 Long Hard Gun Case, 39.8in
(18)
As Low As (Save Up to 14%)
$299.95
See all 3 models
Evolution Outdoor President Series Case
Evolution Outdoor President Series Case
(1)
As Low As (Save Up to $5.00)
$59.99
See all 2 models
Boyt Harness H48SG Single Long Gun Case, 48in, Black, 40139
Boyt Harness H48SG Single Long Gun Case, 48in, Black, 40139
(6)
List: $182.00 (Save 26%)
$133.99
Bushnell 53in Waterproof Roller Hard Rifle Case w/Foam
Bushnell 53in Waterproof Roller Hard Rifle Case w/Foam
List: $399.99 (Save 44%)
$224.99
See all 3 models
On Sale
Boyt Harness Varmin Riflecases with Pocket, OD Green, 48in, 0GC43P489
Boyt Harness Varmin Riflecases with Pocket, OD Green, 48in, 0GC43P489
(5)
List: $159.00 (Save 28%)
$113.79
Galati Gear Discreet Double Square Case
Galati Gear Discreet Double Square Case
(2)
As Low As (Save Up to 26%)
$101.99
See all 6 models
10% Coupon
Eylar Standard 44in Waterproof Roller Hard Rifle Case w/Foam
Eylar Standard 44in Waterproof Roller Hard Rifle Case w/Foam
(8)
List: $359.99 (Save 46%)
$194.99
See all 7 models
Boyt Harness H52SG Hard Sided Single Long Gun Case, 52in, Black, 40156
Boyt Harness H52SG Hard Sided Single Long Gun Case, 52in, Black, 40156
(3)
List: $198.00 (Save 25%)
$149.49
Evolution Outdoor 42in EVA Tactical Double Rifle Case, Black, 51290-EV
Evolution Outdoor 42in EVA Tactical Double Rifle Case, Black, 51290-EV
(2)
List: $139.99 (Save 18%)
$115.39
Best Rated
Savior Equipment Fiddle Master 30in Violin Rifle Case, Black, 31in H x 13in W x 4in D, RC-VIOLIN-BK
Savior Equipment Fiddle Master 30in Violin Rifle Case, Black, 31in H x 13in W x 4in D, RC-VIOLIN-BK
(31)
List: $159.97 (Save 13%)
$139.97
Best Rated
Browning SA-22 Fitted Rifle Case, Black/Tan 1428608090
Browning SA-22 Fitted Rifle Case, Black/Tan 1428608090
(16)
List: $359.99 (Save 33%)
$239.99
Pelican V800, Vault Double Rifle Case, With Foam, Olive Drab Green, 56.11"x 19.15"x 6.65" VCV800-0000-ODG
Pelican V800, Vault Double Rifle Case, With Foam, Olive Drab Green, 56.11"x 19.15"x 6.65" VCV800-0000-ODG
List: $255.99 (Save 10%)
$229.95
Savior Equipment Pro Touring Tennis Variant Single/Double Rifle Case, Black, 31in L x 11.5in H x 3.5in D, RB-TENNIS-V1-BK
Savior Equipment Pro Touring Tennis Variant Single/Double Rifle Case, Black, 31in L x 11.5in H x 3.5in D, RB-TENNIS-V1-BK
(2)
List: $199.97 (Save 15%)
$169.97
SKB Cases rSeries 6416-8 Long Rifle .50 Cal Case, 64x16in, 2R6416-8B
SKB Cases rSeries 6416-8 Long Rifle .50 Cal Case, 64x16in, 2R6416-8B
(3)
$1,429.99
Hazard 4 CL Dropshot Tennis Racket-style Padded Rifle Bag, Black, CL-DRP-BLK
Hazard 4 CL Dropshot Tennis Racket-style Padded Rifle Bag, Black, CL-DRP-BLK
(2)
$229.95
Next

Ammunition

1–19 / 19
Previous
Century Arms M80 7.62x51mm NATO 147 Grain Full Metal Jacket Brass Cased Rifle Ammo, 20 Rounds, AM8293
Century Arms M80 7.62x51mm NATO 147 Grain Full Metal Jacket Brass Cased Rifle Ammo, 20 Rounds, AM8293
List: $25.00 (Save 22%)
$19.59
$0.98/Round
Best Rated
Winchester USA 7.62x51mm NATO 149 Grain M80 Full Metal Jacket Brass Cased Centerfire Rifle Ammunition
Winchester USA 7.62x51mm NATO 149 Grain M80 Full Metal Jacket Brass Cased Centerfire Rifle Ammunition
(11)
As Low As (Save Up to 37%)
$26.39
$1.30 - $1.32/Round
See all 2 models
Supernova Piney Mountain Ammunition Graineen Tracer 7.62mm 124 Grain FMJ Rifle Ammo, 20 Rounds, PMSN762G
Supernova Piney Mountain Ammunition Graineen Tracer 7.62mm 124 Grain FMJ Rifle Ammo, 20 Rounds, PMSN762G
List: $61.99 (Save 20%)
$49.29
$2.46/Round
Supernova Piney Mountain Ammunition Red Tracer 7.62mm 124 Grain FMJ Rifle Ammo, 20 Rounds, PMSN762R
Supernova Piney Mountain Ammunition Red Tracer 7.62mm 124 Grain FMJ Rifle Ammo, 20 Rounds, PMSN762R
List: $61.99 (Save 20%)
$49.29
$2.46/Round
Winchester LC USA 7.62X51 M80 149 Grain FMJ Brass Cased Centerfire Rifle Ammo, 20RD, WINCWM80
Winchester LC USA 7.62X51 M80 149 Grain FMJ Brass Cased Centerfire Rifle Ammo, 20RD, WINCWM80
List: $29.38 (Save $2.69)
$26.69
$1.33/Round
PPU Rangemaster 7.62x51mm NATO 145 Gr Full Metal Jacket Boat Tail
PPU Rangemaster 7.62x51mm NATO 145 Gr Full Metal Jacket Boat Tail
List: $741.99 (Save 11%)
$659.49
$1.32/Round
Hyperion Munitions Veteran Ammo 7.62x51mm NATO 147 Grain Full Metal Jacket Rifle Ammo, 250 Rounds, HMBX762250
Hyperion Munitions Veteran Ammo 7.62x51mm NATO 147 Grain Full Metal Jacket Rifle Ammo, 250 Rounds, HMBX762250
List: $283.99 (Save $21.60)
$262.39
$1.05/Round
Aguila Ammunition 7.62/308 150 Grain Full Metal Jacket Boat Tail, Brass Case, Rifle Ammo, 20 Rounds, 1E762110
Aguila Ammunition 7.62/308 150 Grain Full Metal Jacket Boat Tail, Brass Case, Rifle Ammo, 20 Rounds, 1E762110
(3)
List: $25.69 (Save $1.80)
$23.89
$1.19/Round
PMC Ammunition 762X X-Tac, 7.62x51mm NATO, 147 grain, Full Metal Jacket Boat Tail, Brass, Centerfire Rifle Ammo, 20, 762X
PMC Ammunition 762X X-Tac, 7.62x51mm NATO, 147 grain, Full Metal Jacket Boat Tail, Brass, Centerfire Rifle Ammo, 20, 762X
(2)
List: $37.99 (Save 38%)
$23.69
$1.18/Round
Winchester Matchking 7.62x51mm 175 Grain Sierra BTHP Centerfire Rifle Ammo, 20 Rounds, S76251M
Winchester Matchking 7.62x51mm 175 Grain Sierra BTHP Centerfire Rifle Ammo, 20 Rounds, S76251M
List: $36.19 (Save $1.50)
$34.69
$1.73/Round
Magtech 7.62X51 M80 147 Grain Ball Brass Cased Rifle Ammo, 50 Rounds, 762A
Magtech 7.62X51 M80 147 Grain Ball Brass Cased Rifle Ammo, 50 Rounds, 762A
(1)
List: $55.03
$54.59
$1.09/Round
Sellier & Bellot 7.62x51 200 Grain Full Metal Jacket Subsonic Rifle Ammo, 20 Rounds, SB762SUBB
Sellier & Bellot 7.62x51 200 Grain Full Metal Jacket Subsonic Rifle Ammo, 20 Rounds, SB762SUBB
List: $30.12 (Save 18%)
$24.79
$1.24/Round
Sellier & Bellot 7.62x51 200 Grain Hollow Point Boat Tail Subsonic Rifle Ammo, 20 Rounds, SB762SUBA
Sellier & Bellot 7.62x51 200 Grain Hollow Point Boat Tail Subsonic Rifle Ammo, 20 Rounds, SB762SUBA
List: $39.43 (Save 18%)
$32.49
$1.62/Round
Armscor Precision Inc 7.62x51mm NATO 147 Grain Full Metal Jacket Brass Cased Rifle Ammo, 20 Rounds, 50319-20RD
Armscor Precision Inc 7.62x51mm NATO 147 Grain Full Metal Jacket Brass Cased Rifle Ammo, 20 Rounds, 50319-20RD
List: $19.99
$19.59
$0.98/Round
PPU Rangemaster, 7.62x51mm NATO, 145 Grain, Full Metal Jacket Boat Tail, Centerfire Rifle Ammo, 20 Rounds, PPRM762
PPU Rangemaster, 7.62x51mm NATO, 145 Grain, Full Metal Jacket Boat Tail, Centerfire Rifle Ammo, 20 Rounds, PPRM762
List: $29.00 (Save 13%)
$25.09
$1.25/Round
Hsm Ammunition 7.62x51mm NATO 150 Grain Full Metal Jacket Boat-Tail Steel Cased Centerfire Rifle Ammo, 20 Rounds, 762X511N
Hsm Ammunition 7.62x51mm NATO 150 Grain Full Metal Jacket Boat-Tail Steel Cased Centerfire Rifle Ammo, 20 Rounds, 762X511N
List: $39.99 (Save 13%)
$34.79
$1.74/Round
Sellier & Bellot 7.62x51 147 Grain Full Metal Jacket Rifle Ammo, 20 Rounds, SB762A
Sellier & Bellot 7.62x51 147 Grain Full Metal Jacket Rifle Ammo, 20 Rounds, SB762A
List: $22.01
$21.89
$1.09/Round
Winchester USA 7.62x51mm 149 Grain Full Metal Jacket Rifle Ammo, 20 Round, USAVM80X
Winchester USA 7.62x51mm 149 Grain Full Metal Jacket Rifle Ammo, 20 Round, USAVM80X
List: $27.39 (Save $1.10)
$26.29
$1.31/Round
FIOCCHI AMMUNITION 7.62X3 123GR FMJ Rifle Ammo, 20/20, 762X51
FIOCCHI AMMUNITION 7.62X3 123GR FMJ Rifle Ammo, 20/20, 762X51
List: $37.99 (Save 36%)
$24.29
$1.21/Round
Next

Windham Weaponry R18FSFSM Semi-Auto Rifle, 7.62x51mm NATO, 18 in barrel Unavailable & Discontinued Models

List of Unorderable Models

  • Windham Weaponry R18FSFSM Semi-Auto Rifle, 7.62x51mm NATO, 18 in barrel, 1-10 Twist, A2 Flash Suppressor, 20 Rounds, R18FSFSM308-FRRMPG , MPN: R18FSFSM308-FRRMPG , Code: WIN-04-CTRT367-R18FSFSM308-FRRMPG
Compare (0)
1 item has been added
Add at least two items to compare