I have a Colt 16" HBar Complete upper that I am looking to sell Great condition, not shot much.
Although it is not an m4 (the rail is not numbered) it does have the two ramps cut into the chamber end.
The barrel is a 1:9 twist.
Removable flash hider (has four set screws that secure it).
It is an original post ban upper from an Colt Match Target Competition rifle.
First "I'll take it" will be my buyer.
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