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Aero Precision APAR600201BAC: The M4E1 upper receiver is a one-piece design combining the handguard mounting platform with the upper itself. It is machined from 7075-T6 aluminum with, M4 feedramps, .250 takedown pin holes, and supports barrels with a diameter up to 1". Included is a barrel nut and wrench, port door and forward assist. This model has a black hardcoat anodized finish. NOTE: This upper is not piston-kit compatible.
Note: Aero Precision is listing these under a Blem SKU meaning that they will have a very minor cosmetic blemish of some kind that will in no way affect the function of the product. In our experience, this typically amounts to a minor run-in the anodize or a slightly different color variation than the norm. In most cases, we can not see why they are called blems. They have even told us that the blem in the finish could be hidden away due to it being on the internal surface of the receiver.
