Our 5.56 chambered 16 inch Pencil Profile Carbine Modern Series Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension.

The .625” barrels are called this due to .625″ diameter at the gas block journal. This profile is a thinner and lighter weight version of the original .750".