Brownells Brownells Brownells 75th Anniversary - A Shooting Heritage

Converts Your AR To A Hard-Hitting .30 Caliber Round With No Other Modifications

Direct replacement for the standard .223/5.56mm barrel converts your AR-15 to the high-performance 300 AAC Blackout (300BLK) cartridge. The 300 AAC lets you upgrade your rifle to 7.62 x 39 ballistics, while retaining the standard AR-15/M16 bolt, carrier, and magazine at its full capacity, with no additional modifications. 1-7" rifling accepts bullet weights from 110 gr to 220 gr, and 5/8"-24 muzzle threads accept popular AR-.308 flash suppressors and muzzle brakes. Three models available, 16", 12.5" and 8.2" long and treated inside and out with CMMG’s "Wasp" nitriding process for outstanding resistance to wear and corrosion. 16" barrel has the gas port in the standard position for use with all M4-length gas systems and supersonic ammunition. 12.5" & 8.2" barrels have the gas port positioned for use with pistol-length gas systems.


AR-15, Issue:10, Page:017
Big Book Catalog, Issue:67, Page:017

SPECS: Hardened 4140 chrome-moly steel, Wasp nitride finish, matte black .750" O.D. at gas port.5/8-24 muzzle threads. 

CMMG - AR-15/M16 300 BLK BARRELS

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AR15 12.5" 300BLK MR BARREL
100-014-823WB
AR15 12.5" 300BLK MR Barrel
100014823AR15 12.5" 300BLK MR Barrel

Mfr Part: 30D8A0A

$179.99

In Stock

Cartridge: 300 AAC Blackout

Contour: Medium

Finish: Nitride

Length: 12.5

Gas System Length: Pistol

Muzzle Threads: 5/8-24, ...

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STRIPPED BBL 16" M300 LE AAC W/CAR GAS
100-009-125WB
Barrel Stripped 16" M300 LE AAC w/CAR Gas
100009125Barrel Stripped 16" M300 LE AAC w/CAR Gas

Mfr Part: 30DF80A

$199.99

In Stock

Cartridge: 300 AAC Blackout

Barrel Weight: 2.205 lbs

Contour: Medium

Finish: Black

Length: 16

Gas System Length: Carbine, ...

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AR15 8.2" 300BLK MR BARREL
100-014-824WB
AR15 8.2" 300BLK MR Barrel
100014824AR15 8.2" 300BLK MR Barrel

Mfr Part: 30D810A

$169.99

In Stock

Cartridge: 300 AAC Blackout

Contour: Medium

Finish: Nitride

Length: 8.2

Gas System Length: Pistol

Muzzle Threads: 5/8-24, ...

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AR-15/M16 300 BLK BARRELS