Fits most anything with a bottom picatinny rail - TANDEMKROSS Accelerator Thumb Ledge for Pistols

This thumb rest fits most anything with a bottom picatinny rail. It's a little bulky, but given its versatility that's a minor concession. On most of the pistols I've tried it on there is room in the rail slot to position it forward or backward before tightening it down for a nice precise fit.