RPB Industries Mac 10 receiver, 9mm with Lage Max 10/31K upper receiver.  This upper takes Suomi 31 magazines.  It also has a custom CNC'd stock attachment that provides a folding stock for amazing control.  Runs perfectly. 
 
Fully Transferable, currently in our possession on a form 3 in Indiana.  Will form immediately upon payment to your dealer or can be picked up if preferred after paperwork is approved.  Inspections available upon request.