AR-15 300 Blackout Barrels

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300 Blackout fires a .30-caliber bullet from a standard AR-15: it uses the same lower, bolt carrier group and usually the same magazines as 5.56, so only the barrel changes. It shines in short barrels and with a suppressor, with supersonic loads for the range and heavy subsonic loads for quiet shooting. Most 300 Blackout barrels use a pistol-length gas system, a 1:7 or 1:8 twist and 5/8x24 muzzle threads. Mark your magazines: a 300 Blackout round can chamber in a 5.56 rifle, which is dangerous.

Compare prices below and add one to your build: MyGunLab checks the gas block, muzzle thread and bolt for you.

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Product	Caliber	Length	Gas	Twist	Thread	Color	Best price
Ballistic Advantage Modern Series .300 BLK 1/7 4150 CrMoV - 8"Ballistic Advantage300 Blackout · 8" · Pistol · 5/8 x 24 · Black	300 Blackout	8"	Pistol	—	5/8 x 24	Black	$147.2510 storesIn stockSale
Ballistic Advantage Modern Series .300 BLK 1/7 4150 CrMoV - 16"Ballistic Advantage300 Blackout · 16" · Pistol · 5/8 x 24 · Black	300 Blackout	16"	Pistol	—	5/8 x 24	Black	$171.0011 storesIn stockSale
Faxon Firearms GUNNER, 300 BLK, Pistol-Length, 4150 QPQ - 10.5"Faxon Firearms300 Blackout · 10.5" · Pistol · 1:8 · 5/8 x 24 · Black	300 Blackout	10.5"	Pistol	1:8	5/8 x 24	Black	$151.0012 storesIn stockSale
V Seven 300BLK OUT BARREL 6.5" FLUTED W/ Ti GAS BLOCK & INCONEL GAS TUBEV Seven Weapon Systems300 Blackout · 6.5" · 1:7 · 5/8 x 24	300 Blackout	6.5"	—	1:7	5/8 x 24	—	$395.761 storeIn stockSale
Noveske 300 Blackout Barrel - 10.5 w/ HS BoltNoveske300 Blackout · 10.5" · Pistol · Black	300 Blackout	10.5"	Pistol	—	—	Black	$430.001 storeIn stock
Barrel 300 Blackout 7.5 Pistol-Length BlackFaxon Firearms300 Blackout · 1:8 · 5/8 x 24 · Black	300 Blackout	—	—	1:8	5/8 x 24	Black	$142.6010 storesIn stock
Barrel Stripped 16" M300 LE AAC W/Car GasCMMG300 Blackout · 16" · 5/8 x 24	300 Blackout	16"	—	—	5/8 x 24	—	$179.999 storesIn stock
AR-15 Pistol Length 6 Barrel .300 BlackoutBallistic Advantage300 Blackout · Pistol · 5/8 x 24 · Black	300 Blackout	—	Pistol	—	5/8 x 24	Black	$147.258 storesIn stockSale
300 AAC Blackout 1-7 Twist 8" Pistol BarrelWilson Combat300 Blackout · 8" · Black	300 Blackout	8"	—	—	—	Black	$248.9510 storesIn stock
300 AAC Blackout 1-7 Twist 12.5" Carbon Fiber BarrelProof Research300 Blackout · 12.5" · 5/8 x 24 · Silver / Stainless	300 Blackout	12.5"	—	—	5/8 x 24	Silver / Stainless	$999.0010 storesIn stockSale
Profile 300 AAC Blackout 16" 1-8 Twist Gunner Contour Bbl QPQFaxon Firearms300 Blackout · 16" · Pistol · 1:8 · 5/8 x 24 · Black	300 Blackout	16"	Pistol	1:8	5/8 x 24	Black	$160.0010 storesIn stockSale
Modern AR-15 Pistol Length 10 Barrel .300 BlackoutBallistic Advantage300 Blackout · Pistol · 1:7 · 5/8 x 24 · Black	300 Blackout	—	Pistol	1:7	5/8 x 24	Black	$156.7510 storesIn stockSale
Modern AR-15 Pistol Length 9 Barrel .300 BlackoutBallistic Advantage300 Blackout · Pistol · 1:7 · 5/8 x 24 · Black	300 Blackout	—	Pistol	1:7	5/8 x 24	Black	$152.9910 storesIn stock
Recon Barrel 300BLK 16 Fluted Pistol Gas Stainless 1-7Wilson Combat300 Blackout · Pistol · 5/8 x 24 · Silver / Stainless	300 Blackout	—	Pistol	—	5/8 x 24	Silver / Stainless	$308.959 storesIn stock
AR15 12.5" 300BLK Mr BarrelCMMG300 Blackout · 12.5" · 5/8 x 24 · Black	300 Blackout	12.5"	—	—	5/8 x 24	Black	$181.996 storesIn stock
AR-15/M16 300 BLK S2W Hammer Forged Barrels - 10.3" S2W 300 BLK Barrel, 1-8 TwistDaniel Defense300 Blackout · 10.3" · Black	300 Blackout	10.3"	—	—	—	Black	$323.494 storesIn stock
Hammer Forged 16" S2W Carbine Length 300 BLK Barrel, 1-8 TwistDaniel Defense300 Blackout · 16" · Carbine · Black	300 Blackout	16"	Carbine	—	—	Black	$323.495 storesIn stock
LMT Monolithic 300 AAC Blackout 10.5" Pistol Length Bbl BLKLMT Defense300 Blackout · 10.5" · Pistol · 1:7 · Black	300 Blackout	10.5"	Pistol	1:7	—	Black	$554.405 storesIn stock
LMT Monolithic 300 AAC Blackout 16" Pistol Length Bbl BlackLMT Defense300 Blackout · 16" · Pistol · 1:7 · Black	300 Blackout	16"	Pistol	1:7	—	Black	$554.404 storesIn stock
Pistol Length Match 300BLK 10.5" 1-8 Twist Gunner Contour SS Bbl NitrideFaxon Firearms300 Blackout · 10.5" · Pistol · 1:5 · 5/8 x 24 · Black	300 Blackout	10.5"	Pistol	1:5	5/8 x 24	Black	$179.409 storesIn stock
Pistol Length Match 300BLK 6" 1-5 Twist Gunner Contour SS Bbl NitrideFaxon Firearms300 Blackout · 6" · Pistol · 1:5 · 5/8 x 24 · Black	300 Blackout	6"	Pistol	1:5	5/8 x 24	Black	$170.2012 storesIn stock
Pistol Length Match 300BLK 7.5" 1-5 Twist Gunner Contour SS Bbl NitrideFaxon Firearms300 Blackout · 7.5" · Pistol · 1:5 · 5/8 x 24 · Black	300 Blackout	7.5"	Pistol	1:5	5/8 x 24	Black	$170.2011 storesIn stock
UXR 300 AAC Blackout 14.5" Barrel Conversion KitPrimary Weapons Systems300 Blackout · 14.5"	300 Blackout	14.5"	—	—	—	—	$499.994 storesIn stock
UXR 300 AAC Blackout 14.5" Barrel Conversion KitPrimary Weapons Systems300 Blackout · 14.5" · Black	300 Blackout	14.5"	—	—	—	Black	$499.952 storesIn stock
Performance Series 300 Blackout 8.3" Hanson Pistol W/Lo ProBallistic Advantage300 Blackout · 8.3" · Pistol · 1:7 · 5/8 x 24 · Black	300 Blackout	8.3"	Pistol	1:7	5/8 x 24	Black	$168.999 storesIn stockSale
Performance Series 300 Blackout 10.3" Hanson Pistol W/Lo ProBallistic Advantage300 Blackout · 10.3" · Pistol · 1:7 · 5/8 x 24 · Black	300 Blackout	10.3"	Pistol	1:7	5/8 x 24	Black	$175.999 storesIn stockSale
Contour 300BLK 16" Medium Profile Pistol 1-7 Twist Thread BlackOne Horse300 Blackout · 16" · Pistol · 1:7 · Black	300 Blackout	16"	Pistol	1:7	—	Black	$91.865 storesIn stock
300BLK 10.5" Medium Profile Pistol 1-7 Twist Thread BlackOne Horse300 Blackout · 10.5" · Pistol · 1:7 · Black	300 Blackout	10.5"	Pistol	1:7	—	Black	$88.496 storesIn stock
AR-15 16" Bloodline Barrel Heavy Pistol 1-8tw 5/8-24 .300BLKRosco Manufacturing300 Blackout · 16" · Carbine · 5/8 x 24 · Black	300 Blackout	16"	Carbine	—	5/8 x 24	Black	$169.208 storesIn stock
AR-15 8.2" Bloodline Saucepack .300 BLKRosco Manufacturing300 Blackout · 8.2" · Carbine · 1:7 · Black	300 Blackout	8.2"	Carbine	1:7	—	Black	$280.809 storesIn stockSale

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