Parts & Accessories
Shop AR-15 and AR-10 parts and accessories from Boss Firearms. Our parts inventory includes LMT upper and lower receivers, Proof Research carbon fiber barrels, Forward Controls Design components, Geissele triggers, Magpul furniture, BCM parts, SureFire lights, and much more. Whether you're building a new rifle or upgrading your current setup, we carry the hard-to-find components trusted by military, law enforcement, and serious civilian shooters.
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FCD Forward Controls Design Gen 6 Glock RMR Plate OPF-G6
Forward Controls Design, Inc
$95.00The Forward Controls Design Gen 6 Glock RMR Optics Plate (OPF-G6) is FCD's precision-machined Gen 6 optics plate for mounting Trijicon RMR, Holosun 507/407, and compatible footprint red dot sights to...$95.00 -
KAC Knights Armament SR-15 Stripped Ambi Lower Factory Blem 123689
Knights Armament Company
$749.00The KAC Knight's Armament SR-15 Stripped Ambidextrous Lower Receiver — Factory Blem (KAC PN: 123689) is a genuine Knight's Armament SR-15 ambidextrous stripped lower receiver, offered as a factory...$749.00 -
VLTOR MUR-1A Modular Upper Receiver w/ Bolt Assist Tan MUR-1A-T
Vltor Weapon Systems
$242.96The VLTOR MUR-1A Modular Upper Receiver in Tan (MUR-1A-T) provides the same precision 7075 T6 aluminum construction of the black MUR-1A in a Tan (FDE/Coyote-compatible) finish for coordinated FDE or...$242.96 -
Proof Research 338ARC 16" Carbon Fiber .338 ARC Barrel 145609
Proof Research
$1,149.00The Proof Research .338 ARC 16" Carbon Fiber Barrel (145609) is one of the first precision carbon fiber barrels available for the .338 ARC (Advanced Rifle Cartridge) — a powerful, medium-bore...$1,149.00 -
San Tan Tactical Lower Parts Kit STT-LPK
San Tan Tactical
$40.00San Tan Tactical Complete lower receiver parts kit for AR-15 are a great addition to your AR15 build. From amateur gun builder to seasoned expert gun smith, this lower parts kit is for you. Just add...$40.00 -
Volquartsen 10/22 Replacement Receiver VCFT-AB
Volquartsen
$302.00The Volquartsen 10/22 Replacement Receiver — VCFT-AB is Volquartsen's drop-in replacement receiver for the Ruger 10/22. Machined from billet aluminum to Volquartsen's exacting tolerances, the...$302.00 -
HK Heckler & Koch SP5 Fixed Buttstock 205586
Heckler & Koch
$183.99The Heckler & Koch SP5 Fixed Buttstock (HK PN: 205586) is the genuine HK factory fixed buttstock for the SP5 semi-automatic 9mm pistol. This fixed stock installs on the SP5's rear receiver and...$183.99 -
FCD Forward Controls Design Bolt Carrier Group Serrated SBCG-N-S
Forward Controls Design, Inc
$220.00The Forward Controls Design Bolt Carrier Group — Serrated (SBCG-N-S) is FCD's Secure-Staking BCG with nitride finish and serrated texture on the bolt carrier body. The SBCG-N-S (Secure-Staking BCG,...$220.00 -
FCD Forward Controls Design Bolt Carrier Group Dimpled SBCG-N-D
Forward Controls Design, Inc
$220.00The Forward Controls Design Bolt Carrier Group — Dimpled (SBCG-N-D) is FCD's Secure-Staking BCG with nitride finish and dimpled texture machined into the bolt carrier body. The SBCG-N-D...$220.00 -
VLTOR Receiver Extension 6 Position RE-10-A5SR
Vltor Weapon Systems
$56.66The VLTOR Receiver Extension 6-Position (RE-10-A5SR) is a specialized receiver extension providing 6-position adjustability for use with the VLTOR A5 buffer system or standard AR-10/SR-25 pattern...$56.66 -
FCD Forward Controls Design 5.56 Bolt Catch Dimpled ABC/R v3 AA
Forward Controls Design, Inc
$58.90The Forward Controls Design ABC/R v3 Dimpled 5.56 Bolt Catch (ABC/R v3 AA) is the dimpled-texture (all-around/AA) variant of FCD's ABC/R v3 Augmented Bolt Catch for AR-15/M16 receivers. The...$58.90 -
FCD Forward Controls Design Ambidextrous Charging Handle LPVO #ACF-L
Forward Controls Design, Inc
$118.75 This is a new FCD (Forward Controls Design) Ambidextrous Charging Handle. ACF-L is an AR15/M16 ambidextrous charging handle based on our ACF. Whereas with the ACF, we kept the T handle nearly the...$118.75