Sorry I couldn't be of more help, and don't worry about it. The folks on here can be sticklers for some things, but we're generally a very helpful bunch. Just to let you know, NFA refers to "National Firearms Act of" some date I can't remember because it's of no use to me since I live in Illinois. It includes SBRs (Short Barrel Rifles), SBS (Short Barrel Shotguns), "Machine Guns" (that's a laughable word in my mind), Silencers (should really be called mufflers) and AOWs (All Other Weapons, these are guns that don't fit into the awkwardly defined properties of "pistol, machine gun, shotgun, rifle, SBS, SBR, etc" such as zip-guns). You gun may fall into the SBR or AOW category, I'm not sure. Like I said: being that I live in the great land that lynched Joseph Smith and the College Home State of Ronald Reagan, I've never paid attention.