The Shocktech Super Fly Bolt combines our modified 3 hole Venturi design with a concave tip to facilitate the ball being chambered. Our bolts have an aluminum shaft for strength and delrin anywhere the bolt may contact the inside of the gun for reduced friction. Our bolt is lighter than stock so you may need a heavier hammer. The Shocktech Bushmaster Bolt gives better gas efficiency, tighter chrono groupings, no lubrication needed and it requires next to zero maintenance. A "Drop it in and Go" improvement for your gun.