try this website www.automags.org that might help thats where i i got some of my parts for my mag if not just get the level 10 upgrade it is awsome no more chopping and i dont think the level 7 is being made any more
gaz
id stay away from the venturi bolt and get the level 10 mate as i had nothing but problems with the one i had as the foamie is so small it can smash paint level 10 all the way.