I have posted on here before and I have been given some help in figuring out what I have.

I have a National Ordinance Carbine, which I know is a tragedy. I have read that a lot of the National Ordinance parts were USGI, except for the receivers, I hope I read that correctly.

I am thinking of changing the receiver to a USGI 1.

Three Questions
1. Is a Quality Hardware receiver a USGI receiver?
2. Will it fit on there?
3. How can i tell if the upper is USGI?
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