The criteria in that statement from about 40 years ago was specific to 1968 NFA compliant properly registered class III selective fire weaponry. Don't know about since then.have there been any more since then? i've not heard. lots of "ghost guns" in the news, nobody that went through the process.
Unregistered/illegally converted/stolen class IIIs are likely another story altogether.
And the May 19, 1986 restrictions curbed the number of legal selective-fire guns that would've otherwise been on the market, eventually upping the price about 7-10 years after May 19, 1986; one of the slowest market-impacts from a prohibition/restriction I've witnessed, by the way.
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