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. Type: Semi-Complete Caliber: Multi-Caliber Sights: None, Optic Ready Receiver Description: 7075-T6 Aluminum Receiver Finish: Black Anodized Handguards: N/A