This is an original UZI carbine as manufactured by the Israeli state factory "IMI" in the early 1980s and imported by Action Arms. This is the "B" model that has the folding metal stock and an 18" barrel, with the rear left side of the receiver marked "UZI, semi-auto/MODEL B/ 9mm PARA/ IMI-ISRAEL" and the right side marked "ACTION ARMS LTD/ Phila PA."