Aimpoint Scope Mount 30mm Quick Release Aimpoint 0568059 QRP (Quick Release Picatinny) 30 mm Ring Fits MIL STD 1913 (Picatinny) rails, such as found on flat tops, etc. For all Aimpoint Comp 1X sights. Designed to install repeatedly and maintain zero. Installs and Removes quickly using steel thumb screw with torque limiter. Construction: Aluminum base and ring cap with steel screws, cross bolt, torque limiter and thumb knob. Finish: Hard coat anodized - matte black. Aimpoint QRP Mount 12245