Can you guys visually tell if this is a "C" or not just by looking at it?
It appears to be a non C.
The FSBs are different between the two. The start of the gas tube section is concave on my non C like the picture. On my C it is convex there.
I cannot tell from the pic, but the pins on the Non C FSB are much larger and there is a small square at the top on each side where the sight cover starts that is not present on the C.