The Centurion Arms CM4 upper receiver is manufactured to Mil-Spec tolerances out of 7075-T6 aircraft grade aluminum. After machining, the receivers are anodized per Mil-Spec (MIL-A-8625F) which is a Type III Class 2 hard anodizing process.
-Machined to MIL spec from 7075 T6 forgings
-Top MIL-Std 1913 Rail
-Hardcoat Anodized per MIL-A-8625F, Type III, Class 2
-For Use with M4 Barrel extensions
-Made in America on American-made machines