I was in a pawn shop sat and saw a brand new glock 23 gen 3 and it was a lot cheaper then I thought and it has me wanting one I been wanting a pistol for sometime and I could afford it and I was wondering what would be the difference between the gen 3 and 4 ad far as shooting it I know the gen 3 has the dual recoil spring and the backstrap but as far as shooting it would therr be any different for one to the other is the gen 4 worth the extra money? Thanks