I need some help choosing a new M4. My G&P is being returned to Evike since it broke within the return period. I could probably do the repair myself, but I figured I'd get a new one since they are going to let me exchange it. I've got a KWA mod 2 and it is a great gun. I like it so much, that I thought about getting the mod 1 simply for the increased range over the mod 2, and just pocket $120 from the G&P. If I wanted to upgrade the piston in the Mod 1 for a higher FPS later I could. I'm not a serious player yet, but I am also considering the full metal M4A1 which is $295. Should I just get the Mod 1, or is the full metal version worth the money?