Kevin: I may not have been entirely correct in stating that the guns "came into" the US in 1963-65. ATF Forms 2, which evidenced "receipt or importation" of an NFA weapon, were filed on these guns during that period. The guns might have been imported then (the obvious guess is from Canadaicon) or they might already have been here in the US, but in the possession of someone who was not legally required to register them. I do not have ready access at this moment to the Forms 2, so I am unable to determine who or where the transferor was. The transferee was Interarms in Alexandria, Virginia. Extrinsic circumstances of the acquisition and disposition of these Brens strongly suggest the involvement of an agency of the U.S. government. Time permitting, I might be able in the future to examine the relevant Form 2s and elaborate.

M