I read an article by noted gun writer and self defense guru Massad Ayoob that stated all Glock 30's have the dual action recoil spring/buffer assembly. If that's the case then a Gen 4 Glock 30 wouldn't seem to offer any real advantage in terms of felt recoil would it..?? Just curious because I'm in the market for a 30 and a Gen 3 is considerably less expensive than a Gen 4, and I'm not sure what other bells and whistles that the Gen 4 has that would justify the extra cost. Any info appreciated.