IF the "Big Shots" at BATFE had functioning brains (QUESTIONABLE at best!!), the agency would REOPEN the AMNESTY period for at least another YEAR & NOW (and perhaps forever).
IF the goal is to get "contraband" in out of the cold, that's they way to accomplish the task.
There are literally THOUSANDS of UN-registered NFA weapons out there that would be registered IF the agency was SMART enough to do it.
(I'd bet that I could find any number of FA .30 M2 Carbines, AK, G3 & M16 "clones" here in Bexar County, if I went out looking for them.)
IF I was willing to break the law, I'd bet that I could buy a complete set of M2 parts at ANY Texas gun-show, in less than an hour. = I've seen ever single piece for sale by "parts vendors" for YEARS, locally.