This complete Aero Precision upper includes the styling of their popular M4E1 upper with billet styling, but in a conventionally threaded upper that mates up with their new and very popular ATLAS R-ONE handguard series that is celebrated for the no-fail attachment method, ergonomics, lightweight, and MLOK compatibility.

- This assembly does not include BCG or Charging Handle
- The flash-hider is not pinned and welded to the barrel

Made In America?	Yes
Platform	AR15
Series	R-ONE/S-ONE
Caliber	.300 Blackout
Barrel Length	10"
Weight(s)	-
Other	N/A

Important Note: This 10" complete upper receiver, when installed on a rifle lower receiver, will create a short-barreled rifle (SBR), which is regulated under the National Firearms Act (NFA). Ensure compliance with all federal, state, and local laws, including NFA regulations, before assembly. Alternatively, this upper can be installed on a registered pistol lower receiver for a compliant AR pistol configuration.