Parts & Accessories
Shop AR-15 and AR-10 parts and accessories from Boss Firearms. Our parts inventory includes LMT upper and lower receivers, Proof Research carbon fiber barrels, Forward Controls Design components, Geissele triggers, Magpul furniture, BCM parts, SureFire lights, and much more. Whether you're building a new rifle or upgrading your current setup, we carry the hard-to-find components trusted by military, law enforcement, and serious civilian shooters.
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Knight's Armament - M-LOK Index Stop - 113886
Knights Armament Company
$59.64The Knight's Armament M-LOK Index Stop (KAC PN: 113886) is KAC's precision-machined M-LOK index stop for use on M-LOK compatible handguards, primarily the KAC URX 4 series. The index stop provides a positive reference point for consistent support hand...$59.64 -
Knights Armament - SR15 E3.2 Field Repair Kit - 121261
Knights Armament Company
$196.43The Knight's Armament SR-15 E3.2 Field Repair Kit (KAC PN: 121261) is KAC's genuine factory field repair/maintenance kit for SR-15 E3.2 rifles. The field repair kit contains the critical spare parts and tools needed for field maintenance and minor...$196.43 -
LMT Defense - 7.62/5.56 Flip-Up Battle Sight Set - L8BUIST
LMT Defense
MSRP: $250.00$231.75The LMT Defense 7.62/5.56 Flip-Up Battle Sight Set (L8BUIST) is the complete BUIS (Backup Iron Sight) solution for any AR-15 or AR-10 platform using a primary red dot or variable power optic. The set includes the front flip-up sight and the L8JT rear...MSRP: $250.00$231.75 -
Out of stockOn Sale
LMT Defense - Buffer Tube Kit - 5.56 - #LM556BTK
LMT Defense
MSRP: $97.00Now: $87.30Was: $90.00LMT Defense kept the AR builders in mind with this essential kit for your next project. The LM556BTK is ready to install in your stripped lower. Kit ships with a dry film lubed, Mil-Spec 6 position tube, standard buffer spring, 3oz buffer, standard...MSRP: $97.00Now: $87.30Was: $90.00 -
Out of stockOn Sale
LMT Defense - .308 Semi-Auto Bolt Carrier Group - #LM308D
LMT Defense
Now: $558.00Was: $575.10The LMT Defense .308 BCG was designed with the same materials and principles as the 5.56 Enhanced Bolt Carrier Group. This bolt carrier group is exceptionally durable, and it’s no mystery why the system it belongs to has been selected by...Now: $558.00Was: $575.10 -
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 is the standard-length M203 barrel configuration used...MSRP: $598.00$554.40 -
Out of stock
LMT Defense - Standard 5.56 Full-Auto Bolt Carrier Group - #R-L7D3
LMT Defense
$304.20Full Auto Bolt Carrier Group, 5.56×45 (.223) The L7D3 is the perfect BCG for a Mil-Spec build or upgrade from sub-par equipment. LMT Defense has made the full-auto M16/M4 BCG and its components for years replacement parts for the United States hard...$304.20 -
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 -
Knights Armament - SR-25 Magazine 10-Round - 98037-1
Knights Armament Company
$119.23The Knight's Armament SR-25 10-Round Magazine (KAC PN: 98037-1) is KAC's genuine factory 10-round magazine for the SR-25 semi-automatic precision rifle in 7.62x51mm NATO (.308 Winchester). The 10-round capacity is the standard magazine for states and...$119.23 -
LMT Defense - MRP Locking Screw - 2pk - R-L7S1D
LMT Defense
MSRP: $31.60$29.34The LMT Defense MRP Locking Screw 2-Pack (R-L7S1D) provides genuine OEM replacement locking screws for LMT's Monolithic Rail Platform (MRP) barrel retention system. These are the proprietary locking bolts that secure the barrel extension inside the MRP...MSRP: $31.60$29.34 -
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, and a chrome-lined bore with a 1:7 right hand twist...Now: $538.20Was: $554.40 -
Out of stock
LMT Defense - 5.56 Gen 2 Enhanced Piston Full-Auto Bolt Carrier Group - L7D3CPE
LMT Defense
MSRP: $468.00$425.70The LMT Defense 5.56 Gen 2 Enhanced Piston Full-Auto Bolt Carrier Group (L7D3CPE) is LMT's premium piston BCG designed for the MRP-L platform's short-stroke piston barrels. The Gen 2 enhanced design offers improved reliability, reduced carrier tilt, and...MSRP: $468.00$425.70