Armourer Plug Gauge SM127

Has any one got a picture & dimensions of the Armourers plug guage SM126 or SM127.

I have an Italian one and another one by AJParker both 0.310" but the pass fail Line are at two diferent distances from the front of the gauge.

Thanks In advance Simon

They're marked differently because as I seem to remember, the 126 is a .308" diameter and the 127 is .310. The .308" gauge was replaced with another differently marked gauge called the No2 gauge