Back when the CMP was selling M12s I picked up one at Camp Perry from the "seconds" rack for $100. Stock was rough but it had the base for a Freeland butt pad.
Here's before
https://www.milsurps.com/images/impo...DSCN0104-1.jpg
I glass bedded it, shortened and painted the stock and put on a Freeland pad. Used a Viani base to mount a Sightron 4.5-14 scope.
Here's the after photos.
https://www.milsurps.com/images/impo...00_21801-1.jpg
https://www.milsurps.com/images/impo...03/M12a1-1.jpg
https://www.milsurps.com/images/impo...03/M12b1-1.jpg