well a glock is a glock they havent changed much from gen 1 to the gen 4 but one of the coolest things that glock has done is the tac.rail and adjustable palm rests the gen 4 has a new spring for recoil the texture on the gen 4 is killer get a crossbreed super tuck holster and you will love the combo ( so gen4 glock and crossbreed for me )