Brownells Brownells Brownells 75th Anniversary - A Shooting Heritage

Advanced Technology Coatings For Extended Service Life & Superb Performance

Match-quality barrels feature exotic coatings to give them maximum wear resistance and durability that standard barrel finishes just can’t match. Nitromet™ barrel has been nitrocarburized inside and out with a hardened finish that results in a bore life 50% greater than with traditional chrome-lining. NiB-X™ barrel has the same bore treatment, plus the exterior is coated with WMD’s unique NiB-X nickel boron finish for outstanding surface wear resistance and heat dissipation. Both barrels are made of 4150 steel, chambered for 5.56mm NATO, button rifled with 1-7" twist rifling, and machined to a standard M4 exterior profile with the M203 grenade-launcher cutout. Both come with a NiB-X coated barrel extension installed to help the bolt unlock exceptionally smoothly, especially when used with a WMD NiB-X coated bolt (available separately). Barrel extension has M4-type feed cuts to aid in smooth cycling. Nitromet barrel available in 1-7 and 1-9 twist.


AR-15, Issue:09, Page:018
Big Book Catalog, Issue:66, Page:018

SPECS: 4150 carbon steel, Nitromet (black) or NiB-X (silver) finish. 16" OAL. Standard M4 carbine-length gas system. Chambered for 5.56x45mm NATO. 1-7” twist rifling. ½"-28 tpi muzzle threads. Nitromet barrel available in 1-7 and 1-9 twist.

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2 Item(s)

$234.99

In Stock

Cartridge: 5.56 mm NATO

Barrel Weight: 1.97 lbs

Contour: Carbine

Finish: Nickel Boron

Length: 16

Twist: 1-7

$219.99

In Stock

Cartridge: 5.56 mm NATO

Barrel Weight: 1.96 lbs

Contour: Carbine

Finish: Nitride

Length: 16

Twist: 1-9