The Trijicon Picatinny Rail is designed to mount to Accessory Ring Caps sold for Q-LOC style mounts. The rail can be located at 12 o-clock or either 45 degree positions depending on the accessory being mounted. Features a Mil-Spec drop test rated 6061-T6 aluminum design. Designed to work with Trijicon Q-LOC and Slimline style variable power mounts and accessory ring caps to create a full optics solution in one system.