i have decided to get one. but have read about adjustable gas systems and not sure if that is a necessity, and if so, who's works the best? i have also read that you need the pistol length gas tube, but the ones i see for sale dont tell you. how much shorter is the pistol length tube than that of a 16" barrel?
basically if someone here knows the scoop on what to buy, or more importantly what NOT to buy, please help me out.
thanks