The new Universal Carbine Stock

Quick and easy to attach - the MagPul UCS (Universal Carbine Stock) is designed to be the ideal supplement to the wide array of firearms utilizing a vertical M1913 Picatinny rail on the rear of the receiver. To accommodate a variety of charging handle styles, ejection port locations, and control locations, the UCS features a reversible hinge for left and right folding configurations, and five degrees of drop for clearance.

Here is the video: