The A 1/2" 2-piece Picatinny riser mount by TruGlo is easy to install without additional modifications. The riser mount is ideal for an AR-15 flattop, or any similar configuration where lack of adequate drop at comb makes attaining proper shooting posture difficult. The A 1/2" 2-piece Picatinny riser mount is made from CNC-machined aluminum. Each rail is approximately 1.36" long Raises mounting surface A 1/2" Two-piece design allow for additional clearance around ejector port The TruGlo A 1/2" 2-piece Picatinny riser mount is ideal for mounting scopes, but may be used for red dots as well. Mfg: Truglo