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Genuine Colt Manufacturing M4 upper receiver, forged from 7075-T6 aluminum and mil-spec hardcoat anodized. Comes fully assembled with forward assist and ejection port (dust) cover installed — drop it onto a stripped lower, mate it with a barrel assembly and BCG, and you have a complete upper ready for headspace verification.
This is the same upper receiver Colt uses on its production M4 carbines, which means M4 feed ramps machined into the receiver face and standard M16/M4 dimensions throughout. You get the same fit and finish that goes into Colt LE6920 platforms, not a budget OEM castoff. The hardcoat anodizing handles holster wear, sling abrasion, and weather without wearing through to bare aluminum at the rail flats.
Specs:
Headspace your barrel before live fire if you are pairing this upper with a non-Colt barrel — feed-ramp geometry and barrel-extension fit can vary across brands and a brief headspace check with field gauges prevents extraction issues down the road.
