Built around real-world ergonomics, the BCM Mod 3 Vertical Grip is an ultra-light version of our Short Vertical Grip that directly attaches to either a KeyMod rail system (Mod 3 - KM) or Picatinny rails (Mod 3 - 1913) using a patent pending snag free internal mounting system. Developed by the BCM Engineering Team, the BCM Mod 3 Vertical Grip is an ultra-compact and ultra-light accessory designed to improve the shooters interface with the weapon.