Hey Daddy o' Seven!
I agree with chuckindenver. Those are some good meds you're taking! The rear receiver screw hole does indeed appear drilled thru and the receiver appears to exhibit other characteristics of a Remington receiver. The rear sight is a pre-WWI Springfield Armory rear sight. But you are correct that the drift slide assembly was made by Oneida Limited. I also note that something appears amiss around the ejector pin, but I can't tell what.
I was pleased to read that yo' state joined Utah in passing a college campus right-to-carry law. Please convey my regards to your family!
J.B.