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No such thing.

It is a typo. A 45 mm pistol would fire a bullet larger than a Golf ball. I think you are looking for a .45 CALIBER pistol. That is a handgun that fires a bullet about 45/100ths of an inch in diameter. Perhaps the two best known are the 45 Colt Peacemaker type revolver of cowboy fame, and the 1911A1 .45 Automatic Pistol, used by the US Army.

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14y ago

What else can I help you with?