I think I know the obvious differences in Gen 3 and 4 Glocks, but other than grip adjustability, mag release side choice and the dual captured recoil spring, what else would/did make you pick one Gen over the other. Whichever one you have/like, please elaborate why you chose that Gen. For the record I am no longer a Mass resident, so I can get whichever Gen I want. Thanks for your replies.