Some weapons - like the PPSh-41 and MG-42 - were full-auto-only weapons. Therefore, they are illegal to own in the USA in an intact, as-manufactured form.
nitpick: early PPSH 41's were selctive fire
Is the PPS-43 and Thompson full auto?
Nice AR, but throw the A2 stock off of it. Looks odd with an M4 upper. And where is the flash hider? Got "assault weapon" laws to?