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to provide a fast, secure, and enjoyable experience. by VI, from LA, United States Asked on June 14, 2022
The Aero Precision M4E1 Threaded 5.56 w/ ATLAS S-ONE Handguard Complete Upper Receiver will work with Mil-Spec lower receivers. So it will work with the Colt CR6920 lower reciever.
As long as your Colt conforms to the current mil spec standards, then this upper is compatible.