Railed Gas Tube will fit Russian, Romanian, Bulgarian, Chinese, US and other AKs (stamped and milled) with a standard length gas tube. Handguards will fit stamped receivers AKs (not milled receivers). Will work with some Bulgarian, Romanian and Egyptian lower handguards retainers. Others may need some minor modifications to fit properly. Replaces factory handguards easily; no gunsmithing required. Cooling holes allow the rail to run cool, even after extended firing. Machined from hardened aircraft aluminum with stainless steel components and finished in MIL-SPEC hardcoat anodizing. Attach optics and accessories to the top Picatinny Rail.