A*B Arms Tactical Upgrade Kit The TUKThe A*B Arms Tactical Upgrade Kit (TUK) combines three, top-of-the-line AR-15 accessory brands the A*B Arms polymer hand guard, the Mission First Tactical Engage tactical pistol grip (EPG16) and the DoubleStar DS-4 CAR buttstock. American Built Arms Company continues to deliver high quality, tough as nails products as exemplified in the A*B Arms Tactical Upgrade Kit.- Woodland Digital Camo