Yes- the 507K should mount directly to the pistol but you may or may not need different length 6-32 screws. I had to use the S&W No. 1 plastic adapter plate and Holosun screws to mount a 507C on my M&P 10mm 2.0. I recently swapped out the S&W plate for a C&H metal plate because the fasteners seemed to be working loose. I also just changed out the CR1632 battery, and as shown50 says, put a little blue Loctite on that tiny battery tray screw to keep from losing it! You shouldn't have an recoil issues with your .22 Magnum. Good luck, and enjoy!