Barrels
Maximize your accuracy and velocity with a premium barrel. Shop precision rifle and carbine barrels featuring optimal twist rates, salt nitrided or chrome lining, and threaded muzzles.
Rifle, AR-15, Handgun and Shotgun Barrels
A barrel has more effect on accuracy than any other part of your firearm. Boss Firearms carries replacement and upgrade barrels from LMT Defense, Proof Research, Q, Heckler & Koch and more, in calibers from 5.56 and .300 Blackout to 6.5 Creedmoor and 8.6 BLK.
Shop by type:
- AR-15 barrels in chrome-lined and stainless steel, from 10.5" to 20"
- Rifle barrels, including lightweight Proof Research carbon fiber barrels for precision builds
- Handgun barrels, including threaded barrels for suppressor use
- Shotgun barrels and M203 barrels
- Barrel actions for complete builds
LMT MRP barrel assemblies are a popular choice because the monolithic upper lets you swap barrels and calibers in minutes. Pair a new barrel with a muzzle device or suppressor, and see our LMT Defense parts for matching upper components.
Not sure what fits your rifle? Call 979-704-6269 and we will check compatibility before you order.
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Out of stockOn Sale
LMT Defense - AR-15 SPM10 Top End Full Auto BCG - #STE10F
LMT Defense
Now: $842.40Was: $1,049.00Complete top end includes: Standard flattop upper receiver 10.5" chrome lined 1:7†twist 5.56 barrel Full-auto bolt carrier group Tactical charging handle HandguardsNow: $842.40Was: $1,049.00 -
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...$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...$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...MSRP: $1,000.00$780.00 -
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...$200.00 -
Proof Research - 24" .264 Bolt Action Rifle Barrel - 100912
Proof Research
$999.99The Proof Research 24" .264 Caliber Bolt Action Rifle Barrel (100912) is a premium carbon fiber barrel for bolt-action rifle builders seeking maximum velocity and match accuracy from 6.5mm cartridges...$999.99 -
Out of stock
Proof Research - 24" 30 Caliber Carbon Fiber Blank Barrel- #101001
Proof Research
$999.00By designing a bolt action barrel blank, we have opened up countless options for chambering in your favorite caliber and having the ability to fit a large variety of actions. Our bolt-action barrels...$999.00 -
Proof Research - 22" .264 Bolt Action Rifle Barrel - 105511
Proof Research
$999.99The Proof Research 22" .264 Caliber Bolt Action Rifle Barrel (105511) is a precision carbon fiber barrel for custom bolt-action rifle builds chambered in 6.5mm cartridges including 6.5 Creedmoor, 6.5...$999.99 -
Proof Research - 24" .284 Bolt Action Rifle Barrel - 100943
Proof Research
$999.99The Proof Research 24" .284 Caliber Bolt Action Rifle Barrel (100943) is a match-grade, carbon fiber wrapped precision barrel designed for custom bolt-action rifle builds in .284 Winchester, 7mm-08...$999.99 -
Out of stock
Sig Sauer - MCX Spear LT 9" 300BLK Barrel and Gas Block Assembly - #8901315
Sig Sauer
$899.99Sig Sauer 9” complete stainless steel barrel and gas block assembly compatible with MCX SPEAR LT pattern firearms chambered in .300 Blackout. *Please Note: All NFA rules apply to the installation of...$899.99 -
Proof Research - 6 ARC Carbon Fiber Threaded Barrel 16" - #128657
Proof Research
$1,049.00Proof Research 6 ARC barrels are impressively lightweight, offering up to a 64% weight reduction compared to standard steel barrels. Engineered to handle extreme temperatures. Staying cooler...$1,049.00 -
LMT Defense - 13.5" Chrome Line 7.62 NATO Barrel - R-LM308B413
LMT Defense
MSRP: $697.00$646.20The LMT Defense 13.5" Chrome Lined 7.62 NATO MRP-H Barrel (R-LM308B413) is a mil-spec chrome-lined heavy-profile .308 barrel designed for the LMT MWS (Modular Weapon System) MRP-H upper receiver...MSRP: $697.00$646.20