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. NiB-X™ barrel has been nitrocarburized inside and out with a hardened finish that results in a bore life 50% greater than with traditional chrome-lining, plus the exterior is coated with WMD’s unique NiB-X nickel boron finish for outstanding surface wear resistance and heat dissipation. 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. Comes 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.


AR-15, Issue:10, Page:018
Big Book Catalog, Issue:67, Page:019

SPECS: 4150 carbon steel, NiB-X (silver) finish. 16" OAL. Standard M4 carbine-length gas system. Chambered for 5.56x45mm NATO. NiB-X has 1-7" twist. ½"-28 tpi muzzle threads. Use .750" diameter gas block.

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NIBX 556 M4 BARREL
100-010-607WB
NiB-X Coated Carbine Barrel
100010607NiB-X Coated Carbine Barrel

Mfr Part: NIBX556B1617

$234.99

In Stock

Cartridge: 5.56 mm NATO

Barrel Weight: 1.97 lbs

Contour: Carbine

Finish: Nickel-Boron

Length: 16

Gas System Length: Carbine, ...

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NITROMET 556 M4 BARREL 1-9
100-011-704WB
Nitromet 556 M4 Barrel 1-9
100011704Nitromet 556 M4 Barrel 1-9

Mfr Part: NM556B1619

$219.99

Clearance

Cartridge: 5.56 mm NATO

Barrel Weight: 1.96 lbs

Contour: Carbine

Finish: Nitride

Length: 16

Gas System Length: Carbine, ...

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AR-15/M16 5.56 CARBINE BARRELS