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 Sling Keep A - Elastic Cord SlingKeepA
Forward Controls Design, Inc
$3.00The Forward Controls Design Sling Keep A — Elastic Cord (SlingKeepA) is FCD's elastic cord sling retainer for keeping your sling under control and out of the way when not deployed. The Sling Keep A...$3.00 -
FCD Forward Controls Design Battlewerxs RMR Sealing Plate BattlewerxsRMR
Forward Controls Design, Inc
$10.00The Forward Controls Design Battlewerx RMR Sealing Plate (BattlewerxsRMR) is FCD's precision-machined RMR optic sealing/mounting plate designed for Battlewerx-milled Glock slides. When Battlewerx...$10.00 -
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 -
Out of stock
VLTOR MUR-1A Modular Upper Receiver-KG Gun-Kote MUR-1A-KG-B
Vltor Weapon Systems
$242.96The VLTOR MUR-1A Modular Upper Receiver with KG Gun-Kote finish (MUR-1A-KG-B) provides the precision 7075 T6 aluminum MUR-1A upper receiver with a premium Cerakote/KG Gun-Kote finish for enhanced...$242.96 -
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 -
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,...$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...$183.99 -
Out of stock
Nightforce Tool Kit Scope Mounting Tool Kit #A432
Nightforce
$275.00Nightforce Tool Kit A432Â 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...$275.00