It is marked in military fashion, so it should be 9mm. If a number 2 pencil will go into the muzzle easily, then it is 9mm. If it will not, it is 30 Luger(7.65 Para). Also, a 9mm bullet(not cartridge) will be way to large to enter the muzzle end of the barrel if it is 30 Luger caliber.
|