Anyone know if ALL Intratec TEC-DC9's have TEC-DC9 stamped on the receiver? I recently purchased what was sold to me as a TEC-9 not a TEC-DC9 (no barrel shroud, but has a threaded short barrel, thus isn't an AB-10) and it says TEC-9 on the receiver, but it got me thinking, what's the difference between a TEC-9 'Mini' and a TEC-DC9 then? Anything design wise? Or just the name because the DC ban? It also doesn't have the adjustable style sights like earlier TEC-9s so I was wondering if anyone knew if it could be a TEC-DC9 upper on a TEC-9 lower receiver...?