Very stiff from factory - Magpul Industries Yugo Zhukov-S Folding Stock

You might get lucky, but I had to work out 7 days a week to press the fold button and be able to fold it to screw in the qd sling to screw it into the recvier. You might need to lube up the hinge part to be able to fold it because you need to open it in the folded position to install the QD washer. Other than that, the stock works perfectly after breaking it in. The adjustable stock works even better than described and fits nicely on my cheek and shoulder.