See post #17 https://www.canadiangunnutz.com/forum/showthread.php/1518319-Schultz-amp-Larsons-22-Rimfire/page2M70 has a basic non-adjustable 2 stage trigger that can be set to single stage via a long screw.
M77 has a fully adjustable 2 stage trigger.
Both are excellent 2 stage triggers though.