Premium Grade AR-15 16\" Heavy Profile Barrel, .458 SOCOM, 1:14, Parkerized.\n\nCarbine gas system, with .875 gas block diameter, and threaded for comp. Barrel extension installed with M4 feed ramps.\n\n100% American made. Barrels are manufactured from two types of steel: 4150 Chrome Moly Vanadium; 416 Stainless Steel. They are drilled, reamed, rifled, turned, and if applicable, fluted on CNC Machines. All our finished barrels go through a 100% Inspection Process. Inspections equipment includes CMMs and Air Gauges for the bores. Our Barrels are manufactured under ISO-9002 Quality Systems.\n\nThis item is not available to ship to the following state(s): California | Illinois | Massachusetts | Washington