KCI AR-15 100 Round Drum Magazine For Sale AR-15 Dual Drum Magazine for M-16/M-4. Manufactured in Korea with the finest quality and highest standards, the KCI magazine is the world’s most famous ammunition magazine. Exceeds NATO military specifications and capable of being pre-loaded and stored indefinitely with an estimated lifecycle of 50,000 rounds. Has a unique rotation device and low torsion stress springs
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