These complete stock sets, manufactured from high-strength reinforced polymer, enhance the look of AK-pattern rifles, while providing the rugged performance, extreme weather resistance and solid feel that are all hallmarks of the Arsenal, Inc. rifle lineup. They meet and exceed all mil-spec requirements. They are available in matte black, plum, and desert sand colors. The left-side folding buttstock is patterned after the stocks of the AK-74M and AK-100 series rifles and includes a metal hinge insert, a trapdoor for a compartment for an AK-pattern cleaning kit, high-strength hardened steel ribbed butt plate, and an 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 as a direct replacement and upgrade to the triangular skeleton stocks. The pistol grip follows the original Russian AK-74 pattern and includes a metal reinforcement. The lower handguard incorporates a stainless steel heat shield and metal insert, resulting in decreased heat transfer and maximum user comfort during long shooting sessions. This stock set fits all stamped receiver rifles with folding stock block of AK-74 variant, including SLR-104, SLR-106, and SLR-107 series rifles. These are the only US made mil-spec stock sets in the market that are also 922r compliant.