This unique side folding aluminum stock adapter must be mount to a buffer tube style threaded adapter or base and then a buffer tube can be mounted (threaded). May fold to the left or the right. It can be used with any of our AR stock adapters for the Yugo M92/M85. This part number is for side folding adapter only. Fits Commercial and Mil Spec tubes, does NOT work with non folding regular buffers and buffer springs. Locks in the open position and closed. Light duty only, for pistol buffer tube mount & Air soft only, not for use with arm braces, stabilizer blades or rear stocks, no returns if used incorrectly.