This advertisement is for a Colt M4 semi-auto upper receiver, 16.1 barrel, double handguard, and all internal Colt parts. All of the proper Colt markings are present, and this receiver is ready to be installed. This unit is not pieced together from various parts; this is a factory complete upper receiver and parts. I fired approximately 500 rounds through this receiver and it looks like new. This sale does not include the carry handle or side sling mount (I did not use them/sold). Pictures are available through email.
$650.00 shipped (or best offer).