They already have/do — the NFA and GCA are shining examples of this.
(What's interesting is the reaction you get from certain conservatives
when you assert that the GCA is unconstitutional because its prohibited persons
sections makes it an ex post facto law and therefore the prohibition against [ex-]felons owning firearms is indefensible.)
“(What’s interesting is the reaction you get from certain “conservatives” when you assert that the GCA is unconstitutional because its “prohibited persons” sections makes it an ex post facto law and therefore the prohibition against [ex-]felons owning firearms is indefensible.)”
It’s also interesting when you point out that laws disenfranchising ex-felons violate the 14th amendment.