the ATF dont need my input to come up with stupid laws like make sure you evil AK dosent have an imported barrel nut or that the pistol grip is american made or go to jail for 10 years. they come up with there own stupid crap. I suspose imported electrical tape would be illeagle on the threads. GOOD GRIEF. There more worried about whats on the muzzel end than the guy on the other end. What amazes me is for every simple question there is NEVER A SIMPLE ANSWER. only gray areas. the money they spend passing these laws on this crap is amazing.The BATFE has not made a determinaton that a bayonet is a muzzle attachment, but now that you've put the idea in their heads, expect that to change if there's an Obama bin Biden administration.