Springfield XD 9 40 Tactical Recoil Control Thumb Rest by Magloc (does not fit xd9 with safety; xd45 & xdm) #1330 US Patent D472,599. Reduces muzzle jump by 70% (shooting weak hand only) 1. Improves shooting speed & accuracy. 2. Ambidextrous - fits for left or right hand shooter. 3. Prevents thumb from touching slide. Avoids "slide cuts" on web of shooting hand. 4. Youttube installation instruction: https://www.youtube.com/watch?v=BPp3GGdsr9k