Brownells Brownells Brownells 75th Anniversary - A Shooting Heritage

Heavy-contour 18" barrel is machined from high-grade stainless steel alloy, with a non-reflective matte black Teflon exterior finish. Chambered for 5.56mm NATO ammunition, 6-groove button rifled with a 1-8" twist. Extra length gives additional velocity for better potential long-range accuracy, with M4 feed ramps in the barrel extension and a rifle-length gas system for an extra measure of reliability. Compatible with any standard AR-15 upper.


AR-15, Issue:11, Page:021
Big Book Catalog, Issue:68, Page:019

SPECS: 416 stainless steel, natural silver finish. 18” OAL. .750” O.D. at gas block, .875” O.D. under handguard. Chambered for 5.56 x 45mm NATO ammunition (also accepts .223 Remington). Button-rifled, 6 grooves, 1-8” twist. ½” x 28 tpi muzzle threads. Rifle-length gas system.

AR-15/M16 18" 5.56 Mk12 Barrel SS 1/2-28
231000323AR-15/M16 18" 5.56 Mk12 Barrel SS 1/2-28

Mfr Part: F621036


Backorder, See Associate
Out of Stock

Cartridge: 5.56 mm NATO

Barrel Weight: 2.72 lbs

Contour: Heavy

Finish: Black

Length: 18

Gas System Length: Rifle, ...

click details to view more....

View Dream Gun

AR-15/M16 5.56 MK12 BARREL