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
CVA - V2 Scout Rifle 44 Mag 22" - #CR4431S
CVA
$430.00Designed for rapid, tool-free takedown, the Scout is an ideal emergency or survival firearm—perfect for stashing in your camp gear, boat, or truck. It also comes equipped with a DuraSight® Rail Base...$430.00 -
Knight's Armament - 9 Rib Rail Panel - 97169
Knights Armament Company
$27.99The Knight's Armament 9-Rib Rail Panel (KAC PN: 97169) is KAC's extended 9-rib polymer rail panel for covering unused slots on KAC RAS Picatinny quad-rail handguards. The 9-rib panel covers a larger...$27.99 -
Out of stock
Knight's Armament - Folding M4 Front Sight - Black - #99051
Knights Armament Company
MSRP: $237.16$218.81Originally designed for the US military's SOPMOD rifle enhancement program, the KAC M4 Folding Front Sight is a low-profile backup sighting solution that is designed to be attached to the top rail...MSRP: $237.16$218.81 -
Knight's Armament - Folding Micro Front Sight - 25654
Knights Armament Company
$174.24The Knight's Armament Folding Micro Front Sight (KAC PN: 25654) is KAC's precision folding front iron sight for SR-15, SR-25, and AR-15/M16 pattern rifles with MIL-STD-1913 Picatinny gas block rails...$174.24 -
LMT Defense 5.56mm 16" Piston MRP Barrel Assembly
LMT Defense
$716.85The LMT Defense 5.56mm 16" Piston MRP Barrel Assembly (L7PC1B) is a 16-inch chrome lined 5.56×45 (.223) barrel featuring LMT's short-stroke piston operating system — the key upgrade for shooters who...$716.85 -
Out of stockOn Sale
LMT Lewis Machine & Tool DMR Buttstock
LMT Defense
Now: $391.50Was: $435.00LMT Lewis Machine & Tool DMR Buttstock Designated Marksman Rifle buttstock. Designed for .308 caliber rifles with carbine extension tubes. The DMR stock has comb height and length of pull adjustments...Now: $391.50Was: $435.00 -
Out of stockOn Sale
LMT Defense - .300 Blackout 16" Chrome Lined MRP Barrel Assembly - #L7BK1B
LMT Defense
MSRP: $598.00Now: $538.20Was: $554.40This is a new Lewis Machine & Tool 16-inch .300 Blackout MRP barrel assembly. It features a chrome lined bore with a 1:7 right hand twist. Designed for the LMT monolithic receiver, this barrel...MSRP: $598.00Now: $538.20Was: $554.40 -
LMT Defense - 5.56mm 16" Chrome Lined MRP Barrel Assembly - L7PA1B
LMT Defense
MSRP: $598.00$554.40The LMT Defense 16" Chrome Lined 5.56mm MRP Barrel Assembly (L7PA1B) is engineered specifically for LMT's Monolithic Rail Platform (MRP) upper receivers. This 16-inch, 5.56×45 (.223) barrel features...MSRP: $598.00$554.40 -
Out of stock
LMT Defense - 5.56mm 10.5" Chrome Lined MRP Barrel Assembly - L7MA1B
LMT Defense
$554.40The LMT Defense 10.5" Chrome Lined 5.56mm MRP Barrel Assembly (L7MA1B) is engineered specifically for LMT's Monolithic Rail Platform (MRP) upper receivers. This 10.5-inch, 5.56×45 (.223) barrel...$554.40 -
Out of stockOn Sale
LMT Defense - 6.8 SPC / .224 Valkyrie Enhanced AR15 Bolt - L7Q3C
LMT Defense
Now: $263.35Was: $289.00This is a new Lewis Machine & Tool 6.8 Special and .224 Valkyrie AR15 bolt. It features the same durable construction as LMT’s 5.56 Enhanced Bolt with an emphasis on reliability with use of...Now: $263.35Was: $289.00 -
McCollum Machine M203 37mm 12" Flare Launcher Barrel (fits Colt/LMT M203 receivers)
McCollum Machine
$529.00This 37mm barrel is compatible with 40mm M203 grenade launcher receivers and is intended to allow installation without requiring registration of the receiver as a Destructive Device under the NFA...$529.00 -
Out of stock
McCollum Machine M203 37mm 9" Flare Launcher Barrel (fits Colt/LMT M203 receivers)
McCollum Machine
$529.00This 37mm barrel is compatible with 40mm M203 grenade launcher receivers and is intended to allow installation without requiring registration of the receiver as a Destructive Device under the NFA...$529.00