This is a Magpul Industries Stock known as the Zhukov-S, model MAG552-BLK.
The YUGO Zhukov-S Stock's hinge block for fixed-stock Yugoslavian pattern rifles allows the user to replace their factory buttstock with this high quality folding polymer replacement. The hinge block mounts directly to the unique rear interface of Yugo pattern rifles with the included hardware providing a very robust fit. A no-compromise folding stock for the modern AK" the Zhukov-S Stock folds to the right" has adjustable comb height for optics use via optional cheek risers" is adjustable for length-of-pull without tools" and features an angled rubber butt pad for easy shoulder transition and slip-free performance. An included one-point QD mount at the receiver" optional QD mounting points at the rear of the stock provides multiple sling attachment options. Made in U.S.A. Stock counts as one US compliance part for 922(r).
Features:
Mounts to most stamped receiver Yugoslavian Zastava M70 pattern rifles with fixed stock, recessed trunnion
5-Position
Solid steel hinge pin