I don't know if this is the right forum or not but ill give it a try. I have a new Sig P320 full size 9mm. I have a Gemtech 45 can on it. I does not like the standard 115gr ammo. I heard some people saying it could be the recoil spring. Other times i've heard something about the piston needs adjusted because its a 9mm through a .45 can. Anyone have any help/similar issues?