as an owner of a non- m4 gun, my reccomendation is that unless you *really* want something else, you probably ought to go with one. Parts availability and prices for armalites are significantly better than anything else, simply because everybody and their second cousin has one. But if that doesn't factor into your equation, go for it. CA makes good guns. Word to the wise though, you'll want to make the spring+tightbore upgrades to nearly any new gun you buy.