Well, I've jumped into the retro game. Just received a VGC M16 A1 kit from royal tiger imports. I have a couple questions: I am planning on adding the green mountain 20 barel with 1/12 twist. From my research this is correct for a A1 clone...correct? Also, I am sorting all the parts and wondered if there is a parts list somwhere so they I can make sure everything was included in my shipment. Thanks in advance!