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Compact and versatile 50-round magazine produced for the AR-15 in 5.56x45/.223 and 300 AAC Blackout full length. Designed and built primarily from aluminum and steel, using minimal plastics in it's operating assembly. Engineered using our proven coil magazine technology, which allows side by side staging of ammo in a single stack. The streamlined design allows for no separation of ammunition during function, preventing malfunctions. Our patent pending tension relief device allows the X-15 to operate nearly unlimited spring loads, allowing it to operate in weapons with capabilities 1100 rounds per minute. The profile is shorter than a standard 30 round magazine. User friendly ergonomics and ability to use your sling. Coated in Cerakote for friction reduction and proven reliability without using lubrication, and given a llifetme warranty. Manufactured in the USA. Fits most M16/AR-15 rifles, Bushmaster ACR, SCAR 16 and Stanang Rifles with improved M4 feed ramps. Note: may require modification to work in Robinson Arms XCR and IMI Tavor. No tools necessary to load or operate.