Original, Unfired Colt M16A1 Upper Receiver.
Found buried in a Police Dept. Arms room for 50+ years.
As new as the day it was delivered to the Army.
Since this is a real M16A1 upper it has the correct pin hole for any standard lower .. meaning this isn't a Sporter upper, this is the Real Deal Vietnam upper.
Due to the nature of this individual item we can not offer our standard lifetime guarantee for this item (naturally).
Barrel marking: "C MP Chrome Bore"