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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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 -
LMT Defense MRP-L MLOK 7.25" Upper Receiver & 300BLK Barrel 8.25" Bundle L7NX1A-L7BX1B
LMT Defense
$1,444.50The LMT Defense MRP-L M-LOK 7.25" Upper Receiver & .300 Blackout 8.25" Barrel Bundle (L7NX1A-L7BX1B) is the ultimate ultra-compact .300 BLK package — combining LMT's most compact MRP-L upper receiver...$1,444.50 -
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 -
LMT Defense MRP-L M-LOK 9.25" "Grenadier" Upper Receiver L7SXG1A
LMT Defense
$940.50The LMT Defense MRP-L M-LOK 9.25" "Grenadier" Upper Receiver (L7SXG1A) is LMT's newest 2026 MRP-L upper receiver, purpose-designed for under-barrel launcher integration and versatile accessory...$940.50 -
LMT Defense MRP-L M-LOK 9.25" "Hybrid" Upper Receiver L7SX1A
LMT Defense
$940.50The LMT Defense MRP-L M-LOK 9.25" "Hybrid" Upper Receiver (L7SX1A) is LMT's newest 2026 addition to their Monolithic Rail Platform lineup — a versatile carbine-length upper designed for both piston...$940.50 -
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 -
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...$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...$615.00