922(r) US Parts Compliance. Also a minimum of an additional 3 US made parts are needed to make the system compliant. Here is the ATF list for HK UMP systems: Receiver, Barrel, Mounting Block, Bolt Carriers, Cocking Handle, Trigger Housing, Trigger, Hammer, Sear, Butt Stocks, Pistol Grips, Magazine Housing, Magazine Followers, Magazine Floor Plates.

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