User blog comment:JoeRamirez/Call of Duty Modern Warfare 3 Weapons Wishlist./@comment-1747189-20101208213834/@comment-189.190.27.214-20101231050158

Damn right, 'S' stands for Skladnoy, which is Russian for foldable, if it wouldn't had one, it will have a rigid and wooden stock, like it big brother, the AK-74. PS: 'u' is for Ukorochennyj (small)