I have a used 10.5" Colt 9mm upper for sale. This is a 556 flattop upper, but I don’t believe this was originally a factory configuration. Except for the upper receiver, the rest of the parts are Colt for sure. The upper is an Anchor Harvey forge with a “C” mark, which according to my research was some one of the older variants for a Colt. Also, the ejection port does have an adapter and shorter port door for use as a 9mm upper. The bolt is not ramped.
Upper is complete, with handguards, bolt group and charging handle.
$450 shipped to you.
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