Vodka
RON L here
Hmm, As for wat to build? I'd ask what is your intended use going to be? AS you already have a Gas System M-4, you could Build a 20" Full size AR and see the differences that the 20-24" barell gives you? I'm kind of doing the same thing but in reverse? I presently have a 20" super match and I'm looking to buy a M-4 16" carbine from a Pal of mine? Or, you can swop a Piston system on your orig M-4 and see how ya like that? o many different ways to go, so many fun things t try? Any rate, let us know what ya decide and pics of Course? Good Luck and hope you build what ya like and want?
RON