The Trijicon ACOG Extra High Mount with Trijicon Q-LOC Technology features a Mil-Spec drop test rated 6061-T6 aluminum design, with an easy to use one handed toolless mounting system. The spring-loaded design allows for constant retention and maintaining of zero even if the knobs are not tightened. This mount boasts a low weight and low profile design with precise return to zero performance and is compatible with any Mil-Spec or NATO Picatinny rail. Designed specifically for heads up shooting with the Trijicon ACOG. FeaturesMultiple proprietary recoil lugs ensure total rail engagementMachined from 6061 aluminum for outstanding, repeatable performanceEasily remove and re-attach without needing to confirm zero