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Well it's not hard..."Navy" garands have distinct markings... the OPs rifle is some sort of civilian conversion...it's not military.
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I agree, that in some ways Navy Garands are not hard to identify. However, only the earliest receivers were marked as such. Later on it was just the barrels that were marked. Barrels can be removed and fitted to different receivers, which then makes it hard to tell if it is original.
But, I agree that is not a USGI Navy Garand barrel. As was stated, Navy Garand barrels are marked 7.62NATO and the chambers are cut to NATO specs rather than tighter commercial specs. The area where the caliber is stamped looks problematic, as it looks blued. While the date on the barrel looks USGI, as well as the upside down "P", there is no barrel drawing number(part number). I would agree with a previous poster that I wonder if it is a converted 30-06 barrel.