Centurion Arms MK11 receivers are Knight’s Armament patterned with precision 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. Keeping dimensional accuracy through inspection and deburring all sharp edges, Centurion Arms gives you even more of a reason to build off of this set without charging exorbitant amounts. To top it off, Centurion adds a deep flared, beveled magwell while still keeping the clean aesthetics of simplicity. This is the perfect receiver set to start your battle or precision built AR-10 on.