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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Out of stock
$46.71 -
Out of stock
$46.71 -
Knights Armament - Barrel Extension Action Wrench - 30447
Knights Armament Company
MSRP: $101.35$96.28The Knight's Armament Barrel Extension Action Wrench (KAC PN: 30447) is KAC's purpose-designed action wrench for removing and installing barrel extensions on SR-15, SR-25, and other KAC platforms. This specialized tool is required for proper barrel...MSRP: $101.35$96.28 -
LMT Defense - Rail Mounted M203 Receiver + M203 9" Barrel Bundle - L2B1-LMP380
LMT Defense
$2,341.00The LMT Defense Rail Mounted M203 Receiver + 9" M203 Barrel Bundle (L2B1-LMP380) combines two of LMT's most sought-after 40mm grenade launcher components into one package: the Rail Mounted M203 Receiver (L2B1) and the 9" M203 Barrel Assembly (LMP380)...$2,341.00 -
Out of stockOn Sale
LMT Defense - 243Win 20" Barrel Assembly - #LM243B220S
LMT Defense
Now: $765.10Was: $810.00LMT® 20″ stainless steel 1:10″ RH twist 243 Winchester barrel for MWS upper receivers. Includes low profile gas block, straight gas tube, A2 flash hider. SPECS Barrel Caliber: 243 Win Barrel Length: 20 in / 508 mm Barrel Material:...Now: $765.10Was: $810.00 -
Out of stock
Ruger - Standard Ruger MK IV Upper 6" Barreled Receiver .22 LR - #VCSCU‑0008
Ruger
$30.00This is a factory new never fired Ruger MK IV stripped barreled receiver chambered for .22 LR. This upper comes with adjustable sights and a 6" stubby pencil profile barrel. The push-button takedown makes switching uppers easier than switching from...$30.00 -
LMT Defense - Full-Auto .308 Bolt Carrier Group - LM308DA
LMT Defense
MSRP: $620.00$575.10The LMT Defense Full-Auto .308 Bolt Carrier Group (LM308DA) is a mil-spec 7.62×51 NATO bolt carrier group engineered for LMT's MWS (Modular Weapon System) platform. Full-auto rated for maximum durability, this BCG exceeds the demands of high-volume...MSRP: $620.00$575.10 -
Out of stockOn Sale
LMT Defense - Buffer Tube Kit - .308 - #LM308BTK
LMT Defense
MSRP: $152.00Now: $136.80Was: $144.00The LM308BTK LMT Defense MWS Buffer Tube kit is perfect for those building a weapon on a budget or over time. Get what you need with out parts you dont. This kit is operation ready with our MWS, dry film lubed, buffer tube, recoil spring and H3 buffer...MSRP: $152.00Now: $136.80Was: $144.00 -
LMT Defense - 20" Stainless Steel MWS 6.5 Creedmoor Barrel Assembly - LM650B220S
LMT Defense
MSRP: $947.00$877.95The LMT Defense 20" Stainless Steel 6.5 Creedmoor MWS Barrel Assembly (LM650B220S) is engineered for extreme long-range precision. This 20-inch stainless steel barrel features a 1:8" right-hand twist with 5R rifling — a cut-rifling pattern that produces...MSRP: $947.00$877.95 -
Out of stock
VLTOR - IMOD Improved Modular Stock MIL-SPEC - #AIB-MST
Vltor Weapon Systems
$98.95The IMod MIL-SPEC stock is a vast improvement over the OEM buttstock included on most factory rifles. With interchangeable cheekpieces, rubber buttpad, and optional battery storage tubes, the IMod is a great choice for shooters looking for a comfortable...$98.95 -
Out of stock
VLTOR - IMOD Improved Modular Stock MIL-SPEC - AIB-MSB
Vltor Weapon Systems
MSRP: $98.95$89.06The VLTOR IMOD (Improved Modular) Stock in Mil-Spec (AIB-MSB) is VLTOR's flagship AR-15 collapsible stock, featuring an integrated, modular design with a built-in rear sling loop, cheekweld enhancement, reinforced polymer construction, and 6-position...MSRP: $98.95$89.06 -
Out of stock
VLTOR - Modular Upper Receiver - MUR-1A
Vltor Weapon Systems
MSRP: $269.95$242.96The VLTOR MUR-1A Modular Upper Receiver is a premium mil-spec upper receiver for AR-15 builds, machined from 7075 T6 aluminum with a Type III hard anodize finish for outstanding strength and corrosion resistance. The MUR-1A is a stripped upper receiver...MSRP: $269.95$242.96