Circle 10, Bulgarian-made AK-47 magazines from Arsenal, Inc. follow the original Bulgarian military pattern, featuring a "waffle" textured, polymer magazine body for increased rigidity, longevity, and the utmost in reliable function. Compatible with most AK-47/AKM-pattern rifles in 5.56x45mm. They are mil-spec and the only magazine on the market that can pass the military drop test. Steel reinforcements molded inside the polymer body, these magazines are considered the best and most reliable AK-47 magazines on the market. 5.56x45, 20 rd, Arsenal, Mil Spec, Steel Lug, Circle 10.