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
LMT Defense - 5.56mm 20" Stainless Steel MRP Barrel Assembly - L7SD1S
LMT Defense
Now: $803.70Was: $893.00This is a new Lewis Machine & Tool 20-inch stainless-steel MRP barrel chambered for .223/5.56mm. It features a 1/2x28 threaded A2 birdcage flash hider, low profile gas block with a rifle-length...Now: $803.70Was: $893.00 -
Out of stockOn Sale
LMT Defense - 5.56mm 20" Chrome Lined MRP Barrel Assembly - L7RA1B
LMT Defense
Now: $538.20Was: $554.4020″ Chrome Lined 5.56×45 (.223) 1:7″ RH twist barrel Designed for the LMT monolithic receiver, this barrel utilizes a low profile gas block, rifle length straight gas tube, and A2 birdcage for...Now: $538.20Was: $554.40 -
Out of stockOn Sale
LMT Defense - 5.56mm 14.5" Chrome Lined MRP Barrel Assembly - L7NE1B
LMT Defense
Now: $538.20Was: $554.40This is a new Lewis Machine & Tool 14.5-inch MRP barrel chambered for .223/5.56mm. It features a 1/2x28 threaded A2 birdcage flash hider, low profile gas block with a mid-length straight gas tube,...Now: $538.20Was: $554.40 -
Out of stock
LMT Defense - 5.56mm 12.5" Chrome Lined MRP Barrel Assembly - L7MJ1B
LMT Defense
$554.40This is a new Lewis Machine & Tool 12.5-inch MRP barrel chambered for .223/5.56mm. It features a 1/2x28 threaded A2 birdcage flash hider, low profile gas block with a mid-length straight gas tube,...$554.40 -
Out of stockOn Sale
Surefire SOCOM 3 Prong 556 Flash Hider - 1/2x28
Surefire
Now: $152.00Was: $169.00SureFire’s advanced SF3P three-prong flash hiders deliver superior performance with a patented design that greatly reduces muzzle flash — typically more than 99%. Available for use with a variety of...Now: $152.00Was: $169.00 -
Out of stockOn Sale
LMT Defense - 16" Barreled Upper Receiver .223/5.56mm AR15 - L7UB1
LMT Defense
Now: $685.80Was: $706.50Standard flat-top upper receiver with 16″ chrome lined 1:7″ twist 5.56 barrel. Meeting todays military specifications, the L7UB1 is a near equivalent to the upper delivered on the US M4A1 5.56...Now: $685.80Was: $706.50 -
Out of stockOn Sale
LMT Defense - 14.5" .223/5.56mm AR15 Upper Receiver - L7D1
LMT Defense
Now: $685.80Was: $706.50LMT Defense standard flat-top upper receiver with 14.5″ chrome lined 1:7″ twist 5.56 barrel. Meeting todays military specifications, the L7D1 is a common equivalent to the upper delivered on the US...Now: $685.80Was: $706.50 -
Out of stockOn Sale
LMT Defense - 10.5" Barreled Upper Receiver .223/5.56mm AR15 - L900L08
LMT Defense
MSRP: $762.00Now: $685.80Was: $706.50LMT Defense standard flat-top upper receiver with 10.5″ chrome lined 1:7″ twist 5.56 barrel. Comes with forward assist, port door, sling swivel, front sight post, and gas tube installed. Utilizes...MSRP: $762.00Now: $685.80Was: $706.50 -
LMT Defense - MRP-H Quad Rail 12.75" AR10/AR308 Upper Receiver - LM308B1
LMT Defense
MSRP: $1,274.00$1,181.70The LMT Defense MRP-H® Quad Rail (Picatinny) 12.5" AR10/AR308 Upper Receiver (LM308B1) is built around the patented LMT Monolithic Rail Platform (MRP™) engineered for large-caliber platforms...MSRP: $1,274.00$1,181.70 -
LMT Defense - MRP-H MLOK 12.5" AR10/AR308 Upper Receiver - R-LM308BML1
LMT Defense
$1,181.70The LMT Defense MRP-H® M-LOK 12.5" AR10/AR308 Upper Receiver (R-LM308BML1) is built around the patented LMT Monolithic Rail Platform (MRP™) engineered for large-caliber platforms. Receiver and...$1,181.70 -
LMT Defense - MRP-L MLOK 9.25" AR15 Upper Receiver - L7X1A
LMT Defense
$890.10The LMT Defense MRP-L M-LOK 9.25" AR15 Upper Receiver (L7X1A) features the patented LMT Monolithic Rail Platform (MRP™) — the upper receiver and handguard are machined from a single piece of forged...$890.10 -
LMT Defense - MRP-L MLOK 11.5" Shovelnose AR15 Upper Receiver - L7ZN2A
LMT Defense
MSRP: $1,014.00$940.50The LMT Defense MRP-L M-LOK 11.5" AR15 Upper Receiver (L7ZN2A) features the patented LMT Monolithic Rail Platform (MRP™) — the upper receiver and handguard are machined from a single piece of forged...MSRP: $1,014.00$940.50