Arsenal's left-side folding buttstocks offer solid reinforced polymer construction with metal hinge insert for maximum durability and superior weather resistance. Patterned after the stocks of the AK-74M and AK-100 series rifles, it includes a Mil-Spec trapdoor for a compartment for an AK-pattern cleaning kit, high-strength hardened steel ribbed butt plate, and a steel anti-bind sling swivel. It attaches to the rear block of the rifle via the original 4.5mm pivot pin from the AKS-74 and AKSU rifles and can be used a direct replacement and upgrade to the triangular skeleton stocks. They come in matte black, plum, and desert sand colors. These are the only US made mil-spec buttstocks in the market that are also 922r compliant.