VISM AKM Folding MILSPEC STK Tube Tan The Vism AKM Folding MILSPEC STK Tube allows a variety of AR style Mil-Spec collapsible buttstocks to be installed onto an AK variant. A folding stock adapter improves mobility and allows flexible carry versatility by reducing the overall length of the firearm in the folded position. The adapter folds to the left side of the receiver. It's spring loaded folding action is easy use. It features QD sling mounts on both sides of the stock adapter.