.45-CALIBER PISTOL

a pistol which loads automatically and fires each time the trigger is pulled, with nothing further required of the shooter. The .45 refers to the caliber, or diameter of the bullet, which is .45 inch. —PTS-SP Approved Glossary

a pistol which loads automatically and fires each time the trigger is pulled, with nothing further required of the shooter. The .45 refers to the caliber, or diameter of the bullet, which is .45 inch. If all of a sudden they made a sweeping gain, they're liable to be met with a .45-caliber pistol.