The TruGlo A 3/4" Picatinny riser mount is easily installed without any modification. The riser is ideal for mounting traditional optics but works well with red dot style sights as well. The A 3/4" Picatinny riser mount is perfect for a Flattop AR-15 application, where additional height is often needed to put shooters in a proper position to use an optic. CNC-machined aluminum Raises mounting surface A 3/4" Approximately 4" in length The A 3/4" Picatinny riser mount by TruGlo is mounted directly to the existing Picatinny-style rail. Mfg: Truglo