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Actually for some HK's the receiver is the machine gun, not the sear.
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What are you calling the "receiver"? On the HK, the registered part is the trigger pack or the sear. You can take the trigger pack from a registered MP5, put it on a HK SP-89 and make it a HK MP5K.
My registered sear is "married" to my trigger pack (the trigger pack has a serial number that is shown on my Form 4 as to where the sear is currently installed). My receiver (the upper half) is registered as a short barreled rifle/suppressor on a single tax stamp.
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Is this because the receiver has the ability to accept a fa trigger pack?
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Any receiver will accept the full auto trigger pack.