I have what I believe to be a set of Clymer .308 HS gauges that came with a .308 barrel I bought online at AR15.COM

Both are flat black and are clearly go (green)and no go (red)

What perplexes me is that there are no markings on them.

Go OAL is 1.656"

No Go OAL is 1.666"

The shoulder on the gauges doesnt seem right either...

Do I have the correct gauges? Or are these for something else?

Capt Beach