-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
-Assembled Upper Receivers come with ejection port cover and forward assist installed
-Made in America on American-made machines
I have had the experience to try a number of different branded upper receivers and the Centurion CM4 is right up there with the best, if not the best, that I have tried. There was very little slop with the lowers I tried these receivers on. The inside diameter for the barrel extension was slightly undersized, which allowed for an extremely tight fitting barrel. On top of all this, the T-markings and logo are subdued, not annoyingly white! Keep up the great work Centurion!
Flawless machining, consistent finish, and precise fit. You always hear people talking about Centurion Arms with high regard, and this upper receiver just reaffirms the general consensus. Outstanding product and customer service. Will definitely choose Centurion Arms for future builds.
Fits my KAC and BCM lowers with ZERO slop, yet the takedown and pivot pins still move freely.
I don’t think I’ll be building with any other uppers going forward.