This is a 7.62x39mm polymer 40-round magazine for AK-47 rifles Based on over a half-century of experience and expertise producing AK rifles and accessories, Bulgarian factory AK magazines are some of the finest you can buy. Each magazine has passed rigorous military testing for function, strength, sand/dust tolerance, water & temperature. These extended magazines feature a 40-round capacity, durable polymer slab side construction, and a sure grip finish for positive handling. Steel reinforced feed lips and internals help ensure ultra-reliable function from these rugged rifle magazines.