Ultimate Arms Gear Black Slip On Rubber Recoil Reducing Combat Buttpad Butt Pad For 4 Four Pos. Stock AR-15 AR15 M4 Rifle/Shotgun Great For Rifles And Shotguns That Are Equipped With Standard 4 Position Collapsible Stocks Easy Installation - Simply Slips On Stock's Rear No Modification Required 1/2" Extension : Reduces Recoil And Increases Length Of Pull Classic U.S And Arsenal Bomb Emblem Material : Non Slip Injection Molded Rubber, Color : Black, Weight: 3oz