No. it is not. The problem isn't so much the sear as the action. The top bolt release actions are relieved on the side to allow the bolt release to slide by. The bottom bolt release actions are not. Some have tried bending the release lever on the sear so it will work around the wider/rounder side of the action, but it can break. Also, stocks are inletted differently. I suppose you could also machine a flat relief on the side of the 10t to make more room for the bolt release.
They can be converted, but you would have to inspect them closely to see what needs to be done. It's rather self evident, but not all that easy.
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