Hello all First thread found the forum through a google search while trying to find some info on a MK1 III i have just gotten. Very good condition all numbers match no cracks or major damage to the stock. It came with what i believe is a og sling but it has no markings on it.

The cocking knob and the cutoff are the first things to grab my attention. The knob is round w/o any serrations but more of a stippling on it. Not flat and course like my No4 .

My questions mainly focus on the barrel shank and the unit disc marking "12" and what they mean. Ive asked on a few other forums and was told it is a commercial barreled military rifle pre dispensary?

Thank you for any help or insight.Here are some pictures.






What do these markings mean just behind the rear sight?



What is the hole for on the side of the receiver? Is it a chamber vent in case of OOB?


Thank you for any help
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