The durability, reliability and excellent build quality of Colt uppers will provide years of service you can count on. All Colt M4 Upper Receivers include a forward assist 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.
- Platform: AR-15, M4, M16
- Caliber: 5.56 Nato/.223 Rem
- Cage Code Marked Upper
- M4 Feed Ramps
- Includes Forward Assist and Dust Cover
