Specifically designed for AR-15 and LR 308 rifles. Perfect shooting height with plenty of clearance for 30 round magazines. Rear bag is designed to fit collapsible M4 stocks on one side and fixed A2 stocks on the other. Rifle can easily be rotated for fast magazine changes. Works great with tactical style bolt action rifles as well. Extremely heavy duty Ballistic Nylon fabric holds up to rough edged pic rail hand guards.