Conventional forged 7075-T6 flat-top receiver with M4 feed ramps and standard AR-15 component fit.

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Aero Precision Anodized Black AR15 Stripped Upper Receiver Multi-Caliber 7075-T6 Aluminum Black Anodized
Aero Precision's standard AR15 Stripped Upper Receiver uses a conventional flat-top profile forged from 7075-T6 aluminum. Aero documents M4 feed ramps, .250-inch takedown pin holes, laser-engraved T-marks, and compatibility with standard AR-15 and M16 components.
At 6.9 ounces, this is the straightforward Aero choice for a builder who does not need the M4E1's angular exterior or threaded forward-assist pin. The forward assist and ejection-port cover remain separate parts on a stripped build.
Add the Aero Precision AR15 Stripped Upper Receiver to your build and see how it enhances your platform.