I just purchased a federal ordnance m14. I am aware of the reputation these guns have and was just wondering how I could identify for sure which parts if any on the gun are USGI. the s/n is outside of the range that USGI parts were likely to have been used but I've gotten conflicting reports on that.

Can anyone tell me how to check for USGI parts, or how to do some preliminary checking on how good of a gun I have purchsed?
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