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sear registration issue

  1. HK NFA TALK
    I am thinking of buying a registered sear currently installed in a Mp5k. Just got a copy if the form 4 and it says 9mm under caliber. Some sears are clearly register as 9mm/223/308 and go in different host guns. Seller suggests changing to all 3 cals when doing papers to my SOT or putting...
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