The Liberty Mystic X 3-lug mount is made entirely of stainless steel for long life and durability. The mount was designed specifically for the H&K MP5 (9MM) family of guns. The surface of all parts is treated with a black nitride coating to provide excellent wear resistance as well as give the device a nice appearance. This device threads directly into the Mystic X and is backwards compatible with the original Mystic and the Infiniti as well. Adding just over an inch to the system this is also one of the shortest 3 lug mounts available.