Is anyone here familiar with carrier tilt causing wear in upper receivers on rifles with piston operated actions? I read on another sight that most guns fitted with this system have had this problem. I am all ready to order a PSA Hammer Forged Middy and my buddy is trying to convince me to pick up the Huldra piston upper instead, it's made by Adams Arms and sold as Huldra through Mills Fleet Farm stores. I like the idea behind the piston and also the melanite barrel they use and supposedly they did something different with the BCG eliminating the problem of tilt but I have not seen anywhere it has been proven. I don't want to buy something that is going to wear prematurely causing problems.