I bought this for my SPR build but have decided to go with a Vltor VIS instead. It has never been mounted or had anything mounted to it. It's only been removed from the box for pictures. I will throw in a YHM micro clamp on gas block that I was going to use with this rail for an extra $10 to the person that buys the rail. The only trades I would take would be a VLTOR MUR upper with forward assist and shell deflector that is new or like new, or a higer end 16" carbine length gas barrel that is new or like new. $200 FTF in Tacoma area.