Krebs Custom AK quad-rail system for the Kalashnikov rifle. The AK rail system mounts on any AK style rifle and is rock solid. Fabricated from the finest materials and built on state-of-the-art Krebs Custom machine tool systems. Drop-in fit and a lifetime of trouble-free service. AK quad-rail system will significantly enhance the functionality, performance, and aesthetics of your AK rifle by allowing you to use any of the many accessories available today. It comes with Krebs Custom guarantee, if it fails to perform, return it for refund or exchange it at your option. Made from T6-6061 aluminum with black anodized finish. Designed for use with all configuration AK rifles. Solid, won't shift, forms 4 picatinny rails. SIGNIFICANTLY MORE HEAT RESISTANT THAN OTHER AK RAIL FORE-ENDS. Stays cooler during prolonged firing.