Magloc Tactical Recoil Control Thumb Rest For S&W M&P in 9mm, 40 S&W, 45 ACP cal and M&P 2.0 standard frame #1740 US Patent D472,599. Reduces muzzle jump by 70% (shooting weak hand only) 1. Improves shooting speed & accuracy. Avoids "slide cuts" on web of shooting hand. 2. Ambidextrous - fits for left or right hand shooter. 3. Prevents thumb from touching slide. Wings can be modified with a file to fit different hand size. 4. Youtube installation instruction: https://www.youtube.com/watch?v=DNeQOqX5uEY