Colt M4 Stripped Upper Receiver (P/N SP63528) includes a forward and dust cover. Machined with M4 Feed Ramps and laser engraved T-marks on the Picatinny rail. A thoroughbred upper receiver perfect for a new duty gun or clone build.





Right side of the upper receiver has a stamped Cage Code of 13629. This is an identifier used by the Federal government for parts suppliers and procurements, 13629 is Colt Defense LLC's designation.