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Bravo Company 4-UR-MK2 4URMK2 / BCM4-UR-MK2: Forged from 7075T6, the BCM MK2 Upper Receivers retain a form following grain structure which maximizes achievable strength, the MK2 Upper Receiver retains all Usgi components in assembly and works with all Usgi bolt carriers, charging handles and barrel assemblies.