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 be appreciate it.
Thanks,
Rav
https://www.milsurps.com/images/impo.../6589JPG-1.jpg
https://www.milsurps.com/images/impo.../6592JPG-1.jpg
https://www.milsurps.com/images/impo.../6595JPG-1.jpg
https://www.milsurps.com/images/impo.../6601JPG-1.jpg