THORNTAIL2 Offset Mount picatinny rail adapter attach any Light designed to attach to a 1913 MIL-Spec Picatinny Rail. Positions the Light at a 45 degree offset angle when mounted to a 1913 MIL-Spec Picatinny compliant rail, Ambidextrous with 8 total mounting solutions on 4 sided 1913 MIL-Spec Picatinny Rail system, Forward/Rearward Adjustable 4 slot 1913 Picatinny rail has 4 separate mounting positions on 1913 Picatinny mount base for infinite adjustability, Positions the light as close to the firearm as possible, Light offset optimized at a 45 degree offset for ergonomic activation, Forward mounting design is low profile, lightweight and does not impede weapons manipulation, THORNTAIL2 Offset mount picatinny rail adapter does not interfere with the operation of front back-up iron sights.