This is a Detonator CNC aluminum slide for the Tokyo marui HK45 with night sights included. This one is the tactical version so it has the threaded barrel with it and thread protector. It also will come with the detonator night sights which are replicas of the Trijicon’s that are on the real Hk45. I bought this a couple of years ago but never used it and sold my hk45 a while back so it’s just been sitting in my closet in perfect condition.