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 stock
Two Vets Tripods - 44MM Dual Tension Ballhead W/ Arcalock Dual Clamp (Arca Swiss and Picatinny) - #44MM419QD
Two Vets Tripods
$270.00We’ve partnered with Area 419 to bring you the Area 419 Dual W/ Arcalock Clamp, now available on our ballheads. This innovative clamping system, when used alongside the Area 419 Arcalock rail, effectively eliminates the unwanted forward...$270.00 -
Out of stock
Ruger - Factory Ruger MK IV The Backup Upper 5.5" - #VCSCU-0034
Ruger
$40.00This upper comes equipped with adjustable sights, and its push-button takedown allows for quick and effortless swaps—easier than switching between open sights and an optic. It’s the ideal backup barrel for those who put plenty of .22 LR...$40.00 -
Out of stock
Ruger - Factory Ruger MK IV The Bare Bones Upper 5.5" - #VCSCU-0005
Ruger
$40.00This upper is our most budget-friendly option and a DIY enthusiast’s dream. It offers excellent value for those planning to use an optic or customize their barrel length, provided they have a lathe for the modifications. Brand new No sights (may...$40.00 -
Proof Research - 16" .300BLK LMT MRP Converted Barrel - 100561CONV
Proof Research
MSRP: $1,000.00$780.00The Proof Research 16" .300 Blackout LMT MRP Converted Barrel (100561CONV) is a precision carbon fiber barrel conversion designed to transform LMT MRP (Modular Rail Platform) rifles into .300 Blackout-capable platforms. The 16-inch length provides a...MSRP: $1,000.00$780.00 -
Out of stockOn Sale
Law Tactical - AR-15/M16 Gen3-M Folding Stock Adapter - #99312
Law Tactical
Now: $239.99Was: $269.99Law Tactical's steel adapter enables installation of a folding stock on any AR-15 to create a smaller-profile rifle for easy deployment from a vehicle or transport in non-permissive environments. Works with standard gas impingement OR gas piston system...Now: $239.99Was: $269.99 -
Out of stock
SilencerCo - Bravo ASR Mount - #AC824
SilencerCo
$162.00The Bravo (ASR) Active Spring Retention Mount is a quick attached / detach system for your suppressors that pairs with the ASR Flash Hider, ASR Closed-Tine Flash Hider, ASR Muzzle Brake, and ASR Single Port Muzzle Brake and is one of the best performing...$162.00 -
Out of stock
Forward Controls Design - Castle Nut A5 - #CN5F
Forward Controls Design, Inc
$22.80CN5F (Castle Nut, A5, Forward Controls) is an extended version of CNF we've been making since 2018. CN5F is designed specifically for the superb Vltor A5 system, CN5F is 0.1" longer, and is as long as we can make a castle nut while ensuring...$22.80 -
Out of stock
Glock - UTM G19 Gen 5 MMR/TBR Conversion Kit w/2 Mags + Ammo Bundle - 01-4110
Glock
$200.00This is a used like new UTM (Ultimate Training Munitions) Glock 19 Gen 5 MMR/TBR Conversion Kit slide that is bundled with one 50-round box of UTM man marker training rounds and two Glock OEM 10-round magazines with a orange in color training baseplate...$200.00 -
Out of stockOn Sale
American Defense - Like New Scope Mount - 1312-Recon-S-Like-New
American Defense MFG
Now: $162.00Was: $180.00These are in like-new condition, they were new rifle takeoffs. The AD-RECON-S mount is made for putting high power glass onto a flattop style AR-10, Galil, Bolt Action Rifles, and Lever Action Rifles. This mount is best suited for the AR-10...Now: $162.00Was: $180.00 -
Out of stockOn Sale
American Defense - Like New Scope Mount - 1316-Recon-SL-Like-New
American Defense MFG
Now: $162.00Was: $180.00These are in like-new condition, they were new rifle takeoffs. Similar to the AD-RECON-S, the AD-RECON-SL mount is made for putting high power glass onto a bolt action rifle, M1A, M-14 or 10/22's. This mount is best suited for Bolt Action Rifles...Now: $162.00Was: $180.00 -
Out of stock
Knights Armament - Like NewSR-15 Ambidextrous Charging Handle Assembly - 31177-Like-New
Knights Armament Company
$178.20The KAC 5.56mm Ambidextrous Charging Handle is another step forward in the effort to deliver the most ergonomic firearm accessories to the end user. Intermediate sized latch pads are easily accessible and permit manipulation of the charging handle with a...$178.20 -
Out of stock
Heckler & Koch - Like New MR556/AR-15 5.56x45mm 30-Round Magazine - 251770S-Like-New
Knights Armament Company
$30.00The Heckler & Koch 30-Round Steel Magazine is the top choice for AR-15 magazines, designed for use with the H&K Model 416 and MR556. It ensures optimal ammunition feeding for any M16/M4/AR-15-style weapon and is compatible with any firearm that...$30.00