Centurion Arms Stripped C4 5.56 Forged Upper Receiver Features: THESE ARE STRIPPED UPPER RECEIVERS MIL-Spec inner dimension measures at 1.000 -0.0/ 0.002″ For Use with M4 Barrel extensions Made in America on American-made machines Weight: 6.8oz Material: 7075 T6 Forgings Top: MIL-Std 1913 Rail Finish: Hardcoat Anodized per MIL-A-8625F, Type III, Class 2
