I followed Dan's instructions and removed the Mag Safety Lever on my M&P 40. The spring I used to replace the lever and spring was a used Glock extractor plunger spring that fit like a glove over the retaining pin. I shorten the spring per Dans instructions and it works perfectly. Now I have a pistol that ops in the same manner as the SIGS, GLOCKS during tactical loads and range quals. I guess I'm too old to change my habits, thanks again Dan, your instructions were invaluable.