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2,219 Posts
Not to hijack, but I am having this same question also- as I understand it, so long as semi-auto receiver and full-auto trigger pack can NOT be joined together, you're in the clear. If you remove the shelf on the receiver, or modify the factory full-auto pack to fit over the shelf, then you've assembled an illegal MG and are headed to prison. Considering buying up a MP5 parts kit but already have HKs in the safe, don't want to get in trouble for parts-kit full-auto trigger pack.