With the very real possibility of this country taking an even sharper turn left I've decided to take the plunge and get in to the "black gun" club. I have plenty of handguns and long guns of every action but just haven't ever had the desire to own one for myself. I guess I'm kind of a purist but I'm not going to be left behind after someone thinks they can make my decisions for me. I've operated many different brands and know the jists of them but all in 556/223. Personally I'm not a fan of that round but that's another discussion. What I'm looking for is the cliff notes on what to shop for and why. My questions are: Piston vs gas and why Weight is an issue to me, I don't want a 10lb+ battle rifle. Price is a factor but not a deal breaker Ability to accept cheap and a variety of magazines Must be able to fire/cycle/feed both 7.62 NATO and .308 Win Is there anything else I need to know before taking the plunge?