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Aero's M5 receivers are engineered to match flawlessly, providing the operator superior performance and accuracy in a durable and dependable platform Upper Receiver Features: Platform: M5 (.308) Material: Machined from 7075-T6 forged aluminum M4 Feedramps.2795" takedown pin holes (DPMS size) AR 308 High Profile (.210) Tang Accepts standard DPMS.308 components Laser engraved T-marks Includes Port Door and Forward Assist Lower Receiver Features: Platform: M5 (.308) Material: Machined from 7075-T6 forged aluminum Markings: "Cal Multi" Works with standard DPMS 308 components and magazine Mfg: Aero Precision.