This idea ...

.
... has merit:

As a tense situation unfolds in Nevada, an activist from another western state has developed what he bills as “a helpful, if not a total ...outside the box solution” for “reining in federal employees.” Calling it “a useful tool for the states' took kit that should not be ignored,” Montana Shooting Sports Association President Gary Marbut has proposed the Government Workers Licensing Act to exert state authority over federal employees and to require training in rights to be part of their certification requirement.

And like all ideas that have merit, it will be disregarded. RTWT

Marbut notes that states have historically reserved  police power (and it's been upheld at the SCOTUS); it's my laymans' opinion that that is a viable attack on 922(o).

pm