As I understand it there were changes to the law dealing with manufacturers that require those easy mods to be made impossible without significant machining work. Also, anyone capable of that kind of work has the skills needed to make a full-auto from basic materials.
Regarding magazines: I do understand the magazine thinking and some of the restriction ideas. I am only focused here in this thread on the idea of the AWB as presented in HR 1808. AFAIK most states have a 5 round (or less) magazine limit on deer, elk, bear or moose sized game. The skill set for hunting a deer and defending yourself in your home is completely different. With a deer after the first shot, the deer is either completely disabled, injured and running away or you missed and it's gone. Home defense probably needs either 0 to 1 shot or many.
Thanks for the exchange. 
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