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
LMT Defense - Purchase the 16" .308 Lightweight Stainless Steel Barrel LM308B116S get the LMT Torque Wrench LTW for FREE
LMT Defense
$852.30LMT BARREL: The Lewis Machine & Tool MWS rifle systems come with a wealth of enhancements like a monolithic handguard and upper receiver and a chrome lined barrel with a durable lock-up system. Now...$852.30 -
Out of stock
LMT Defense - Purchase the 16" .308 Barrel LM308B116PS get the LMT Torque Wrench LTW for FREE
LMT Defense
$842.40Take advantage of this exclusive Boss Firearms bundle and get the LMT Defense 16" .308 Lightweight Chrome Lined Piston Barrel (LM308B116PS) together with the LMT Defense Torque Wrench (LTW) for FREE...$842.40 -
Out of stock
LMT Defense - Purchase the 7.62 NATO 13.5" Barrel #LM308B413 get the LMT Torque Wrench #LTW for FREE
LMT Defense
$627.30LMT BARREL: LMT® 13.5″ chrome lined 1:10″ RH twist 7.62×51 barrel for MWS upper receivers. Includes low profile gas block, straight gas tube, A2 flash hider.$627.30 -
LMT Defense - Purchase the 7.62x51mm 16" Chrome Lined Barrel Assembly LM308B216 get the LMT Torque Wrench LTW for FREE
LMT Defense
$627.30Take advantage of this exclusive Boss Firearms bundle and get the LMT Defense 7.62x51mm 16" Chrome Lined MWS Barrel Assembly (LM308B216) together with the LMT Defense Torque Wrench (LTW) for FREE...$627.30 -
Out of stock
LMT Defense - Purchase the 300 Blackout 8.25" Barrel #L7BX1B get the LMT Torque Wrench #LTW for FREE
LMT Defense
$598.00LMT BARREL: Upgrade your AR-15 with the LMT Defense 8.25" Barrel in 300 Blackout. Specifications:Â 8.25" Length Chrome Lined 1/7" RH Twist 300 Blackout$598.00 -
Out of stock
LMT Defense - Purchase the 5.56mm 16" Barrel Assembly #L7PA1B get the LMT Torque Wrench #LTW for FREE
LMT Defense
$538.20LMT BARREL: Designed for the LMT monolithic receiver, this barrel utilizes a low profile gas block, mid length straight gas tube, and A2 birdcage for reduced flash. The barrel is coated and...$538.20 -
Out of stock
LMT Defense - Purchase the 5.56mm 10.5" Chrome Lined Barrel Assembly #L7MA1B get the LMT Torque Wrench #LTW for FREE
LMT Defense
$538.20LMT BARREL: This is a new Lewis Machine & Tool 10.5-inch MRP barrel chambered for .223/5.56mm. It features a 1/2x28 threaded A2 birdcage flash hider, low profile gas block with straight gas tube, 1:7...$538.20 -
Out of stock
LMT Defense- Purchase the 5.56mm 11.5" Chrome Lined MRP Barrel Assembly #L7TA1B get the Torque Wrench #LTW FREE
LMT Defense
$538.20LMT BARREL: LMT Defense 11.5″ 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, carbine length straight gas...$538.20 -
Out of stock
LMT Defense - Purchase the 10.5" Chrome Lined MRP .300 Blackout Barrel #L7BH1B get the Torque Wrench #LTW for FREE
LMT Defense
$538.20Barrel: This is a new Lewis Machine & Tool 10.5-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...$538.20 -
Out of stock
LMT Defense- Purchase the MRP-L MLOCK 11.5" Shovelnose AR15 Upper Receiver #L7ZN2A get the Lower Receiver #M7SL for FREE
LMT Defense
$1,045.00Upper Receiver: The patented LMT monolithic rail platform (MRP) upper receiver, has a receiver and handguard that are made from a single piece of aerospace grade aluminum. The barrel is held in place...$1,045.00 -
Out of stock
LMT Defense- Purchase the MRP-L MLOK 11.5" Specwar AR15 Upper Receiver #L7Z1A get the Lower Receiver #M7SL for FREE
LMT Defense
$1,045.00Upper Receiver: The patented LMT monolithic rail platform (MRP) upper receiver, has a receiver and handguard that are made from a single piece of aerospace grade aluminum. The barrel is held in place...$1,045.00 -
Out of stock
LMT Defense- Purchase the MRP-L Quad Rail 13.25" AR15 Upper Receiver #L7RA1A get the Lower Receiver #M7SL for FREE
LMT Defense
$1,045.00Upper Receiver: The patented LMT monolithic rail platform (MRP) upper receiver, has a receiver and handguard that are made from a single piece of aerospace grade aluminum. The barrel is held in place...$1,045.00