It works but tradeoffs - DPM Walther P99/PPQ M2/Long Slide Mechanical Recoil Reduction System

4" PDP with an hour at the range with the shortest spring, the recoil did feel better. Sadly the slide was not capable of locking back on an empty magazine. I suspect the results on a 4.5 or 5 would be better. Going to donate it to my brother who has a 5" PDP to see if he has any luck with it making improvement without a reload disability as a trade off.