I have right at $400 in my truck gun. I also used a PSA LPK with a set of JP springs. It runs like a champ.One of mine is an Aero stripped upper and lower that was built up with PSA LPK &BCG and a nice barrel and runs great. Just bad luck on this one I guess. I have a total of $375 into this frankenrifle in 300AAC do i cant complain if it took a little work.