Gentlemen, thanks for all of the observations, I learned some important points.
Please oblige us with a picture of the receiver ring showing the serial number.
Thanks! And Merry Christmas!
J.B.
Here you are.
SN.jpg
I appears reasonably certain that you have one of those. Thanks for obliging us!
Merry Christmas!
J.B.
What is "One of those?"
Looks like USMC front sight cover. These can go for $50-$80 when you can find them.
J.J.