I too looked for a stock for my M12. The only company I found that did something close to stock is Elk Ridge, give them a gander. I haven't ordered from them yet as my money is going into a different project at the moment.
Ordered a Stith laminated stock ( Red/Grey ) had Don pillar bed same, and install a custom polished aluminum butt plate. I put a Vianni scope mount on top w/Lupe 24X. Never Looked Back. Ron