Just bought a new RMR and had the slide milled out by Battlewerx(awesome job by the way). It's on a gen4 22. I am now having troubles with the slide locking to the rear on an empty mag. I am not limp wristing it. I have tried 10 different mags, with all different kinds of ammo, and all the same result. I was thinking about a lighter recoil, to a 15lbs. Anyone have any other thoughts how to fix this?