For sale is a MAC-10 upper chambered in 9x19.  This is the upper only and it has a 12.5 inch barrel and the front pistol grip threads onto the muzzle threads.  It has an AR style forend, a side charging handle, rear sight and a pictitanny rail.  No manufacturer is listed and this upper appears to be unfired.  No bolt with this upper.  This is a pistol length upper and you are responsible for knowing your NFA laws.  No FFL is required being this is a stripped upper.