The A 1/2" Picatinny riser mount by TruGlo has been designed to raise a mounting surface of existing Picatinny-style rails. The riser is made of solid CNC-machined aluminum and installs easily without modification. It is ideal for mounting scopes but can be used for red dot sights as well. The A 1/2" PIcatinny riser mount is perfect for any AR-15 Flattop. Approximately 4" long Raises mounting surface A 1/2" Use the A 1/2" Picatinny riser to put an optic in proper position for the shooters eye. Mfg: Truglo