922(r) Compliant Parts. The ATF has identified 12 countable parts on the MP5. 6 total US parts are needed for 9mm MP5 builds. Receiver, Barrel, Trunion, Bolt, Bolt Carrier, Cocking Handle, Trigger Housing, Trigger, Hammer, Sear, Buttstock, Pistol Grip, Forearm / Handguard, Magazine Housing, Magazine Follower, Magazine Floorplate.
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