Rock River Arms Mid A4, Semi-automatic, 308NATO, 16 Barrel, 1:10 Twist, Mid-length, Black Finish, Hogue Grip, 6-Position Stock, 20Rd, RRA 2-Stage Trigger 308A1239 Things can happen in the blink of an eye. In those few precious moments your firearm must not fail. That's why Rock River Arms takes pride in supplying you the highest quality firearms possible.