In Texas you don't need a license to carry a rifle/shotgun loaded or not
Is there a comprehensive list of what each state allows and doesn't allow? I'd be interested in looking at that.
In Texas, you can also carry lawfully-owned (i.e., registered in the NFRTR) NFA items without a license. I suppose it might be possible to conceal a Serbu Super-Shorty.
Fla's permit is a weapon permit. If it's legal you can carry it, if you can stand the scrutiny.