Colt flattop upper receiver with M4 feedramps, current 2021 to present production. These are guaranteed to have Colt’s CAGE code 13629 marked above the forward assist.
Colt CAGE code will either be roll marked or dot matrix stamped. Square or keyhole forge code. These include T numbers and M4 marked above the gas tube hole. No choice of marking style.
Complete with forward assist and ejection port cover. Correct Colt gray dry lube inside the upper. Both take down holes are mil-spec 0.250″.
New in the sealed MIL STD Colt poly bag. Pictures show one removed from the wrap for clarity.