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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Out of stockOn Sale
LMT Defense - Semi-Auto 5.56 Bolt Carrier - L7A3A
LMT Defense
Now: $116.10Was: $119.70Standard semi auto carrier assembly - carrier only. Does not include the firing pin, cam pin, or firing pin retaining pin. As with all LMT bolts/carriers these are test fired at the factory and will show evidence of such. Weight:0.566 lbs Caliber: ...Now: $116.10Was: $119.70 -
LMT Defense - 5.56 Enhanced Bolt - L7Q3B
$404.55If our standard bolt is the infantryman of the gun industry, then our enhanced bolt is the delta operator. This bolt was designed to function effectively in full-auto, suppressed, and short barrel weapon systems, and it is made of materials far...$404.55 -
Out of stockOn Sale
LMT Defense - 5.56 Bolt - L7A3B
LMT Defense
Now: $145.80Was: $150.30LMT Complete Bolt features milspec phosphate finish, gas rings installed, and proper black extractor insert with Crane O-ring. Bolt is MPI and HP tested and marked “MP”. When you shoulder your weapon, it must operate flawlessly – even...Now: $145.80Was: $150.30 -
LMT Defense - M4 GEN2 Collapsing Buttstock - L291B
LMT Defense
MSRP: $86.10$79.83The LMT Defense M4 Gen2 Collapsing Buttstock (L291B) is LMT's updated Generation 2 mil-spec M4-style collapsible buttstock. Designed for AR-15/M4 carbine platforms, the M4 Gen2 features improved fit and finish over the standard mil-spec buttstock with...MSRP: $86.10$79.83 -
Out of stockOn Sale
LMT Defense - Full-Auto Ambidextrous Selector - LMP092AA
LMT Defense
Now: $57.87Was: $59.67LMT Defense Full-Auto Ambidextrous Selector. This no frills, tough as nails, ambi safety is a perfect low cost upgrade to your LMT or any other AR-15/AR-10 weapon system. This is a steel, two piece design with equal length levers for quick and...Now: $57.87Was: $59.67 -
LMT Defense - Semi-Auto Ambidextrous Selector - LMP092CAA
LMT Defense
$59.67The LMT Defense Semi-Auto Ambidextrous Selector (LMP092CAA) provides true ambidextrous safety/selector operation for AR-15 builds. This drop-in ambidextrous safety selector features levers on both the left and right sides of the lower receiver, enabling...$59.67 -
Out of stockOn Sale
LMT Defense - Forward Assist - LMP1115
LMT Defense
Now: $33.39Was: $34.47LMT Defense Forward Assist. Fits all LMT rifles.Now: $33.39Was: $34.47 -
LMT Defense - MRP Rifle Length Gas Tube - LM308B2E
LMT Defense
$34.47The LMT Defense MRP Rifle Length Gas Tube (LM308B2E) is a genuine LMT replacement gas tube for MWS (.308/7.62 NATO) MRP barrel assemblies. LMT MRP barrels require low-profile gas blocks with straight gas tubes — this rifle-length straight gas tube is the...$34.47 -
Out of stockOn Sale
LMT Defense - MRP Pistol Length Gas Tube - L7S1B3BRA
LMT Defense
Now: $33.39Was: $34.47LMT Defense MRP® gas tube for 300 Blackout Barrels SPECS Operating Method Direct Impingement Barrel Caliber 300 BLK Upper Type MRP PartsNow: $33.39Was: $34.47 -
Out of stockOn Sale
LMT Defense - Estonia 5.56 QD Muzzle Device - L8FH3P556E
LMT Defense
Now: $67.68Was: $69.75Flash hider designed for the Estonian Military not only looks sleek and aggressive; it drastically reduces muzzle flash, and allows for quick connector sound suppressors.Suppressor ready flash hider models:1/2x28 TPI for AR-155/8x24 TPI for AR-10 (and...Now: $67.68Was: $69.75 -
Out of stock
Sons of Liberty Gun Works - NOX Flash Hider 7.62mm/30 Caliber - #NOX-300
Sons of Liberty Gunworks
$115.00The Sons of Liberty Gun Works NOX series of muzzle devices blend the line between flash hider and compensator. They provide excellent flash suppression, muzzle climb reduction, and allow the quick installation of suppressors and accessories utilizing...$115.00 -
Out of stockOn Sale
Magpul - PMAG M3 7.62 20rd. AR10/SR25 Magazine - MAG291-BLK
Magpul Industries
Now: $21.80Was: $22.95Magpul's 7.62x51 NATO (.308 Winchester) PMAG 20 LR/SR GEN M3 is a lightweight, cost effective, highly reliable magazine for SR25/M110 pattern rifles. It features true 20-round capacity, a constant-curve body, an anti-tilt follower, and a snap on impact /...Now: $21.80Was: $22.95