SBR's that are tax stamped, VS Pistols that have a brace, and are not. One, we pay a significant federal tax for and hop through flaming hoops. The other, we don't. In my mind, if I paid a federal tax, the ability to restrict is moot. Historically, I'm thinking full auto that where pre-ban. Those folks paid a tax and are now exempt (with very specific restrictions, no doubt.) Could the same be true of SBR's in the future? Restrict away on semi's (what will happen first) and SBR's , but wouldn't the tax stamp, as a federal tax, be a form of protection?