From The Guardian:

An executive action announced by the White House last year said that all members of legally certified trusts buying or receiving federally regulated weapons would need to identify themselves by submitting photographs, fingerprints and a signed approval from a local law-enforcement chief to US authorities.

In any case, the implementation of the new rule appears to have staved off for the time being by the vehement opposition lodged with the ATF. Williams, of the American Silencer Association, said he and colleagues had been told by senior ATF officials in a meeting in Nevada in January that “they received more comments than they anticipated, and because of that, the final ruling likely won’t be issued until next year”.