The Ballistic Advantage 14.5 Inch Modern Series – YHM 5300 KR7 Keymod Rail upper features a Ballistic Advantage 14.5 inch Modern Series Govt Profile Barrel, chambered in 5.56, 1:7 twist, carbine length gas system, .750 journal and a 1/2-28 threaded muzzle. Machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension. Built on a Milspec forged flattop receiver with a Yankee Hill Machine 5300 KR7 Keymod Rail and an A2 flash hider.

These are assembled and test fired by PK Firearms.