This is an expensive way to mount a scope to an AR15 using standard scope rings. Raises scope aprox. 1/2". I only used it a few times and it looks like new. Check out this link for all of the details: Leupold Mark 1tegral Mounting System (IMS) 1-Piece Picatinny-Style ... ttop-matte $30 in the Puyallup/South Hill/Graham area.