Im not new to firearms but new to the AR, which brings me to my question. What are the pros of a straight gas tube system versus the gas piston system? I know the straight gas is dirtier while the piston is cleaner, but thats about it, i have no experience with the pistons. Is their really a difference in accuracy, or realiability? or is it just a matter of preference? Im building my first AR and havnt bought an upper so help me out here:D

