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Double is "Double Action". 9m is 9mm. I am sure. But I did not find the one you are asking about.

Robert, Double Action is the capability to pull the trigger a 2nd time to fire a round that did not go off without having to rack the slide. 9m = 9mm is the caliber the pistol is chambered for of course. Cheers and stay safe!

The double refers to a double action pistol. The 9m is 9mm(great caliber). Also I would like to point out Walther has a current promotion that is "love it or your money back". If you are thinking of pulling the trigger on it, I hope that helped. Stay safe and have a great day!!

Robert, The 9 mm refers to the chambering of this PPQ. The double action means you can pull the trigger over and over again. They use the double action term to say "constant trigger pull" (Walther's terminology) for the technology that keeps striker fully loaded at all times for trigger pull after trigger pull.

double is double action where the trigger pulls back the hammer and releases it (single action the hammer must be back and the trigger just releases it) 9m is 9mm which is the caliber of bullet the gun takes