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 stockOn Sale
Knights Armament - SR-15 Carbine Mod2 Complete Upper - 14.5 E3 Mod 2 - #31949
Knights Armament Company
Now: $2,088.62Was: $2,198.54The SR-15 E3 MOD 2 series’ 5.56mm NATO barrel is manufactured for military grade durability, and is free-floated inside a URX4 M-LOK handguard. An improved E3 round-lug bolt design both enhances...Now: $2,088.62Was: $2,198.54 -
Out of stockOn Sale
LMT Defense M203 Quadrant sight, Rail Mounted
LMT Defense
Now: $387.90Was: $444.15LMT Defense Quadrant sight, mounts to a 1913 picatinny rail upper receiver.Now: $387.90Was: $444.15 -
Out of stockOn Sale
LMT Defense - M203 Leaf Sight Handguard Mounted - 8448330
LMT Defense
Now: $175.50Was: $180.90Leaf Sight for Standard M203 Grenade Launcher. Mounts directly to the standard handguard.Now: $175.50Was: $180.90 -
Out of stockOn Sale
LMT Defense M203 Leaf Sight L2B/L2X Mounted
LMT Defense
Now: $243.90Was: $251.55LMT Defense Leaf sight developed exclusively for use with the LMT® rail mounted M203 launchers. This sight mounts via the rear rail screw of the launcher receiver.Now: $243.90Was: $251.55 -
Out of stockOn Sale
LMT Defense M203 Rifle Length Mounting Kit
LMT Defense
Now: $440.10Was: $461.70LMT Defense M203 Mounting hardware kit with leaf sight assembly. Mounts to standard M203 for a standard A2 rifle with 20″ barrel.Now: $440.10Was: $461.70 -
Out of stockOn Sale
LMT Defense M203 Carbine length Mounting Kit
LMT Defense
Now: $342.00Was: $352.35The LMT M203 Carbine Length Mounting Kit mounts to a standard M203 for a standard or M4 type carbine. Includes M203 mounting hardware and leaf sight assembly.Now: $342.00Was: $352.35 -
Out of stockOn Sale
LMT Defense - Short Rail Mount Pistol Grip Frame - L2X1PG
LMT Defense
Now: $823.50Was: $940.50LMT Defense Short Rail Mounted M203 Grenade Launcher Pistol Grip Frame. Does not include receiver or barrel. Allows for mounting of L2X launchers.Now: $823.50Was: $940.50 -
LMT Defense - Barrel Mount Complete Frame - L2H1PG
LMT Defense
MSRP: $1,329.00$1,232.10The LMT Defense Barrel Mount Complete Frame (L2H1PG) is the complete mounting frame for the LMT rail-mounted M203 grenade launcher system. This frame provides the structural mounting interface...MSRP: $1,329.00$1,232.10 -
Out of stockOn Sale
LMT Defense - Rail Mount Complete Frame
LMT Defense
Now: $1,196.10Was: $1,232.10LMT Defense Rail Mounted M203 Grenade Launcher Complete Frame. Includes pistol grip and SOPMOD buttstock. Does not include receiver or barrel. Allows for mounting of L2B and L2D launchers.Now: $1,196.10Was: $1,232.10 -
Out of stockOn Sale
LMT Defense - Short Rail Mount Complete Frame - L2X1S
LMT Defense
Now: $1,196.10Was: $1,232.10Short Rail Mounted M203 Grenade Launcher Complete Frame. Includes pistol grip and PDW buttstock. Does not include receiver or barrel. Allows for mounting of L2X launcherNow: $1,196.10Was: $1,232.10 -
Out of stock
LMT Defense - M203 BARREL 12” - LMP360
LMT Defense
MSRP: $598.00$554.40The LMT Defense M203 Barrel 12" (LMP360) is a 40mm grenade launcher barrel assembly for the M203 grenade launcher system. The 12-inch barrel provides increased velocity compared to the 9" barrel and...MSRP: $598.00$554.40 -
LMT Defense - Front Flip-Up Sight GEN2 - L8KG2
LMT Defense
MSRP: $162.00$150.30The LMT Defense Front Flip-Up Sight GEN2 (L8KG2) is LMT's mil-spec front backup iron sight (BUIS) — NSN issued (NSN: 1005-01-648-5899) and compatible with all LMT rifle sight systems. This flip-up...MSRP: $162.00$150.30