Yugoslavian M72B1 RPK Underfold Style AK-47 rifle. These semiautomatic versions of the RPK M72 rifle are built by James River Armory from Original Grade A M72B1 parts kits utilizing enough US parts to make them 922rd compliant. Very rare underfold version. Rifles feature a brand new U.S.-made heavy finned 21 inch barrel and a J.R.A. 1.5 mm thick heavy receiver, and underfolding stock. The resulting weapon is a Yugoslavian based rifle with all of the military spec quality of the original Yugo Zastava based sqad automatic rifle. Semi-Auto, 7.62x39 Caliber, Accepts all standard AK-47 Mags and Drums. Ships complete with 1-30 round mag.