Combination diameter gauge for checking bore wear of firearm equipment

The utility model relates to a bore wear inspection combined diameter gauge of firearm equipment, a first bore wear diameter gauge of the combined diameter gauge is of a sleeve-shaped structure, and the end face of a first end part and the end face of a second end part are respectively provided with an opening; the second bore wear diameter gauge, the third bore wear diameter gauge and the fourth bore wear diameter gauge are detachably mounted in the hollow cavity of the first bore wear diameter gauge in sequence; the side wall of the first bore wear diameter gauge is provided with a window communicated with the internal hollow cavity, and the window is used for storing the third bore wear diameter gauge. The combined diameter gauge can be used for checking rifling abrasion conditions of muzzles of various types of firearms with the calibers of 5.8 mm, 7.62 mm, 8.6 mm, 9.0 mm, 12.7 mm and 14.5 mm according to the requirements of GJB4536, checking of rifling abrasion conditions in front of gun barrel chambers