Faxon Firearms AR-15 Duty Gunner Big Bore 458 SOCOM 16" Barrel

This Duty Series barrel puts 458 SOCOM on the AR-15 platform at 16", in Faxon's Gunner Big Bore profile, and weighs 1.72 lbs. It runs a carbine length gas system with an .875" gas block, and the Big Bore M4 extension comes installed and headspaced, with its feed ramps opened up for the bigger case.

Faxon pairs it with its Big Bore upper, cut for that case, and a .458/.450 bolt, so plan the rest of the build around those parts. The 11/16-24 muzzle threads need a device or suppressor mount to match. It is button rifled and nitrided inside and out.