Most people find the easiest way to disengage the safety is to press upwards with the shooting hand thumb. However, if you look at the M9's safety you'll see it has a significant radius on the rear half of the lever. It's actually designed to pop into the fire position when you sweep your thumb
down across that radius. Take a little practice but once you get the hang of it, you can disengage the safety about as easily as you would a 1911's. It's certainly not as ergonomic and depending on your thumb size you may want to practice the upward sweep as a secondary/back-up solution.
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