Barrel is made of a proprietary blend of Hammer-Forged chrome molly vanadium "4150" alloy made by FN that is referred to as "Machine Gun Steel" by virtue of its use in FN's M249 and M240 weapons. The hammer forging process work-hardens the steel, making it more durable. In addition, the chrome process for the bore allows for a lining almost twice as thick as a standard M16 for enhanced durability.
Chambered in 5.56 NATO, with a 1/7 twist to allow effective use of heavier grain bullets. M4 barrel extension for enhanced feeding capability under high rates of fire, and a mid-length gas system. The Special A2 Light profile starts with a traditional a2 profile and lightens it, between the gas block and muzzle, for greater mobility.
Barrels are Mil-spec phosphate coated to withstand corrosion and are individually high pressure tested and magnetic particle inspected to ensure quality and reliability.
Please check the barrel closely for any irregularities. It is the builder's responsibility to check headspace before assembling.
In the unlikely event you have an issue with a barrel, STOP AND DO NOT ASSEMBLE. Contact Customer Service.