I endorse all the comments above which specify dry firing, practicing, etc. They are good, time tested techniques. However, there is another technique I have used. It is just the opposite of what has been recommended. If I am concerned with flinching with my 9mm pistol, I start by firing several mags of 45acp. By the time I get done with that exercize.....the 9mm seems like a pea shooter. The flinching is greatly relieved.

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Pete T.