No overtravel of the hammer anymore. Fits in the most RNV without the lock in the grip frame.
Threat of the screw is metric: M3
Allen wrench for the screw 1.5mm
Grip frame needs minor modification to have space for the stop and the adjustment screw. Round file or end mill 1/4" diameter recommended. I recommend to use a 1/4" endmill. That keeps the stop in place from sliding forth and back. I also recommend to use blue loctite to secure the screw.
While this part is easily installed, it is not drop-in, it requires fitting by a competent Gunsmith.