I have the AXG Pro w a 507c x2 slide mounted (6-40) and it is PERFECT ! I’m looking for upgrading trigger to match the GGP trigger kit by Wilson combat ( trying to get it as close to that as possible at least ) and maybe play w the guide rod and recoil system just for fun and then grip panels at some point.. but AXG PRO out of the box is 10/10 all around!