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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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 Multicam AR-15 builds. The Tan MUR-1A is a stripped...$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 AR-platform cartridge designed for extended range barrier...$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 your favorite Trigger, AR-15 Lower, Buffer Tube...$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 replacement receiver features tighter fits for barrels and...$302.00 -
Out of stock
KAC Knights Armament Company - URX6 Tool Kit for SR-25/SR-15 #122659
Knights Armament Company
$702.24The tool kit includes 5.56/762 URX6 Handguard Wrench, 5.56 URX6 barrel nut removal wrench, 7.62 URX6 barrel nut removal wrench, KAC knightstick, gas block puller, buttstock wrench, gas block wrench, and gas tube wrench.$702.24 -
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 provides a solid, fixed shoulder stock for supported...$183.99 -
Out of stock
Nightforce Tool Kit Scope Mounting Tool Kit #A432
Nightforce
$275.00Nightforce Tool Kit A432 is a compact, purpose-built kit designed for mounting and maintaining your Nightforce optics with confidence. This all-in-one package includes the tools needed for installing rings and mounts, adjusting fasteners, and now...$275.00 -
Out of stock
Criterion CORE Series 300 AAC Blackout AR-15 Barrel 10.5" #300B-10CR3
Criterion
$329.99The Criterion CORE Series is an ideal pairing for the versatile .300 AAC Blackout cartridge. The modern taper improves on government contours, eliminating harsh diameter variations and adding material where it is needed the most. The CORE Series’...$329.99 -
Out of stock
Noveske SPR 6MM ARC 18" Barrel 1:7 Twist Rifle-Length Gas System #07000433
Noveske
$615.00The Noveske 18" SPR stainless barrel in 6mm ARC features a 1:7 twist rate and a rifle-length gas system with a low-profile configuration. It is threaded 5/8x24, includes a headspaced bolt, pinned gas block, and gas tube, and has extended hand-polished...$615.00 -
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, Nitride, Serrated) uses FCD's proprietary secure-staking...$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 (Secure-Staking BCG, Nitride, Dimpled) uses FCD's proprietary...$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 large-frame rifles. This extension bridges the gap between...$56.66