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I found it here;
http://www.milsurps.com/showthread.php?t=57165
Thanks for all your help.
Rav

When you turn the knob, there is a piece that comes down from the bottom, which looks like it may engage against a locking should and the gauge becomes longer.

Anyone have more information about this Inspectors Headspace Gauge. It slides into the rails for the receiver. I bought this some years ago, from a parts dealer in Canada. Any and all help would...

Please help, in identifying these tools. I purchased them, some 25 years ago, while visiting a dealer in Port Elgin Ontario. If I recall correctly, they are for the Canadian C1 9mm SMG. I believe...