Huh?

Not sure I can explain any of this.

What is it, exactly, that is to be gained by passing a federal law, for the prohibition of felons procuring body armour?

I mean, we've already tried the gun control route with this same demographic, and that hasn't been exactly a stellar success, has it? I'd cite some examples, replete with links, but I find it unnecessary with such things; it's tantamount to trying to provide evidence of two plus two actually equalling four, or something similar.