12-22-2014, 06:44 AM
Alan, I just found your post and link to the pictures on the other forum.
FYI: What you have there is a very early Colt A1 upper receiver. These were mated to a "slab sided" (no fence around the magazine release button.) Colt lower receiver. The letters C K inside the valley below the rear sight hole, and the larger pivot pin hole identify the receiver as a Colt. C = Colt (manufacturer), K = Kaiser Aluminum (foundry that made the forging). Colt was the only manufacturer to use the larger pivot pin AFAIK.
Sell or trade this receiver but don't cut the handle off of it. There are tons of flat top receivers available out there. Your early A1 receiver - not so much.
FYI: What you have there is a very early Colt A1 upper receiver. These were mated to a "slab sided" (no fence around the magazine release button.) Colt lower receiver. The letters C K inside the valley below the rear sight hole, and the larger pivot pin hole identify the receiver as a Colt. C = Colt (manufacturer), K = Kaiser Aluminum (foundry that made the forging). Colt was the only manufacturer to use the larger pivot pin AFAIK.
Sell or trade this receiver but don't cut the handle off of it. There are tons of flat top receivers available out there. Your early A1 receiver - not so much.
Willie