This stock was used on a Max T/A High Rib version (60%-100%), and at the lowest setting shot 100% high. So, I am thinking it could be for the “Extra High” version of rib choices (100%-150%). Has upgraded wood and ebony cap. The newer version stock lock single pin upgrade, so no ball bearing. In very good condition with some nicks and scratches. $1200 shipped.
If you choose, you can set this stock to permanently lock, if you don't like the motion. Then if you choose to use the recoil reduction, you can adjust it to your liking very easily.