For a hand gun they initially used the Webley Revolver, which in time was replaced by the Colt 45 pistol, which used the same ammunition as the Thompson submachine gun.
They initially used the Webley Revolver. This was for a hand gun. The Webley Revolver in time was replaced by the Colt 45 pistol. The Colt 45 pistol used the same ammunition as the Thompson submachine gun.