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
Sons of Liberty Gun Works - Blaster Starter Kit - #BSK
Sons of Liberty Gunworks
Now: $54.15Was: $57.00The Sons of Liberty Gun Works AR-15 lower parts kit comes with almost everything you need to finish building your lower receiver. Also known as the blaster starter kit, the only components missing...Now: $54.15Was: $57.00 -
Out of stock
LMT Defense - 7.62x51mm 13.5" LW Chrome Lined MWS Barrel Assembly - LM308B113
LMT Defense
$727.20The 13.5-inch lightweight profile .308/7.62x51mm chambered MWS barrel features a chrome lined bore with a 1:10 right hand twist. Designed for the LMT MWS receiver, this barrel utilizes a low-profile...$727.20 -
Out of stockOn Sale
LMT Defense - .300 Blackout 16" Chrome Lined MRP Barrel Assembly - #L7BK1B
LMT Defense
MSRP: $598.00Now: $538.20Was: $554.40This is a new Lewis Machine & Tool 16-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 barrel...MSRP: $598.00Now: $538.20Was: $554.40 -
LMT Defense - 5.56mm 11.5" Chrome Lined MRP Barrel Assembly - L7TA1B
LMT Defense
$554.40The LMT Defense 11.5" Chrome Lined 5.56mm MRP Barrel Assembly (L7TA1B) is engineered specifically for LMT's Monolithic Rail Platform (MRP) upper receivers. This 11.5-inch, 5.56×45 (.223) barrel...$554.40 -
Out of stockOn Sale
LMT Defense - 5.56 lower parts kit w/trigger - LM556LPK
LMT Defense
Now: $313.20Was: $322.65Complete your build with only the best lower parts kit available. This is the same kit that LMT’s world famous weapons are built with so why wouldn’t you want it in your rifle? 100% American...Now: $313.20Was: $322.65 -
Out of stock
VLTOR - FAL Rifle Series Handgaurd #CASV-FA
Vltor Weapon Systems
$329.95 - $358.95The CASV-FAL handguard is designed for the FAL series of rifles. They mount solidly to the standard inch or metric FAL with a short version for the carbine style FALs. It is mounted at the receiver...$329.95 - $358.95 -
Out of stock
Unity Tactical Hot Button Light Activation Switch Picatinny Compatible with Surefire Tailcaps Black #HBR-SB
Unity Tactical
$119.00Hot Button is a revolutionary control device for weapon-mounted electronic accessories. It provides a 45 degree angle button interface for a more natural press angle at any position around a weapon...$119.00 -
Out of stockOn Sale
LMT Defense - 7.62 NATO barrel assembly 20" Stainless Steel - LM308B220S
LMT Defense
MSRP: $947.00Now: $852.30Was: $877.95LMT AR-10 Barrel for use with the LMT MWS upper receivers. Specifications: 7.62 NATO / .308 20" Stainless steel 1:11.25" RH twist 5R cut Low profile gas block Straight gas tube A2 flash hiderMSRP: $947.00Now: $852.30Was: $877.95 -
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 -
Out of stock
Sig Sauer - MCX/MPX Folding Stock - Minimalist Plus - Black - #STOCK-X-FOLD-PLUS-BLK
Sig Sauer
$199.99SIG SAUER factory aluminum minimalist plus, folding stock installs easily on your MCX/MPX via the receiver's 1913/picatinny interface. Overall length - 9"Overall height - 4.5"Butt-pad width - ...$199.99 -
Out of stockOn Sale
Knight's Armament - M4/M5 RAS Hardware Kit - 30450
Knights Armament Company
Now: $33.17Was: $34.92The KAC Medium URX II free floating forend features an integral, flip-up front sight assembly that folds flush with the continuous top rail when not in use, creating a seamless look. Full length...Now: $33.17Was: $34.92 -
Out of stockOn Sale
LMT Defense - MRP Mid Length Gas Tube - L7S1B3
LMT Defense
Now: $33.39Was: $34.47LMT Defense MRP® gas tube for 5.56 16″ barrels and .308 16″ or less barrel. SPECSNow: $33.39Was: $34.47