Gun Parts
Welcome to the Gun Parts superstore at Boss Firearms Company, LLC. Whether you are undertaking a custom precision build, performing routine armorer maintenance, or upgrading an existing platform, we stock the high-performance components you need. As an authorized dealer for premium OEM and aftermarket manufacturers, we provide everything from stripped receivers and match-grade triggers to enhanced bolt carrier groups (BCGs) and duty-ready barrels for rifles, handguns, and shotguns.
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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 -
Out of stock
LMT Defense MRP-L MLOK 10.5" Complete Upper Receiver Bundle LMTMLOKS10.5AS
LMT Defense
$1,625.00The LMT Defense MRP-L M-LOK 10.5" AR-15 Complete Upper Receiver Bundle (LMTMLOKS10.5AS) is a factory-complete LMT upper receiver assembly for AR-15/SBR builds, combining LMT's 9.25" M-LOK monolithic...$1,625.00 -
Out of stock
LMT Defense MRP-L Quad Rail 10.5" Complete Upper Receiver Bundle #LMTQuadS10.5AS
LMT Defense
$1,625.00LMT Defense - MRP-L Quad Rail 9.25" AR15 Upper Receiver - #L7S1A The patented LMT monolithic rail platform (MRP) upper receiver, has a receiver and handguard that are made from a single piece of...$1,625.00 -
LMT Defense MRP-L Quad Rail 13.25" AR15 Complete Upper Receiver LMTQuadL16AS
LMT Defense
$1,700.00*Discounts do not apply* The LMT Defense MRP-L Quad Rail 13.25" AR-15 Complete Upper Receiver (LMTQuadL16AS) is a factory-complete LMT upper receiver assembly — including the 13.25" quad rail...$1,700.00 -
Out of stock
LMT Defense MRP-L MLOK 16" Complete Upper Receiver Bundle #LMTMLOKL16AS
LMT Defense
$1,700.00MRP-L MLOK 13.25" AR15 Upper Receiver - #L7Y1A The patented LMT monolithic rail platform (MRP) upper receiver, has a receiver and handguard that are made from a single piece of aerospace grade...$1,700.00 -
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