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Ballistic Advantage BABL556028M: Ballistic Advantage's 5.56 chambered 16 inch Pencil Profile Midlength 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".