ok well i have have a stock 2001 autocockre with a 13 inch armson stealth and im thinking of upgrading it but i have no idea of what to get i've seen some other peoples guns and cant decide on what to get the only thing i know i want is a roller sear and a shocktech superfly bolt and maybe a ans front block and a pmi regulator are there any other upgrades any one would prefer. im not really willing to get a new barrel just quite yet though.