Thompson Contender

The Thompson Contender is a hunting pistol used as a Mystic Code by Emiya Kiritsugu during the fourth Holy Grail War. At the time of the fourth Grail War, he had left it along with the remaining 12 bullets in the care of Hisau Maiya 9 years earlier, and uses it again in the war.

It has grip and fore end carved in walnut, a gun barrel 14 inch long, reminiscent of a dagger in its scabbard. The handgun parts are only the trigger and the percussion hammer, then the cylinder and slide cannot be found on the simple exterior, which makes it close to a percussion pistol from the last hours of the Middle Ages.

The Contender was developped in 1967 by the American company Thompson Center Arms; is a single shot pistol with a break-open cartridge chamber. This gun is essentially a pistol for target shooting sport. It is simple yet powerful, and the barrel chamber can, with little modification, shoot various ammunition from .22LR to rifle bullets. The structure is simple, with minimal accessories between the break-open barrel and the trigger, and the hit rate is high. The 12 inch model is 394 mm long and weights 1587 g. The 14 inch model is 444 mm and 1700 g; this is the model Kiritsugu modified for his personnal use.

Kiritsugu's gun barrel has been switched to make use of the hunting specifications of the large caliber, and furthermore, it has been magically modified to make use of "magic bullets" for rifling to give his shots magical properties.

The bullets used are .30-06 Springfield, which bring the total weight to 2060 g. A cartridge with a bottleneck structure, its size and power level are already different from those of a handgun bullet. The .30-06 is 10% stronger than the .308 Winchester bullet, and even surpasses the hand canon class of a Magnum bullet. Discharged from a handgun, it would have extreme firepower.

In the core of the 12 remaining special bullets are sealed powdered bones from Kiritsugu himself. When Kiritsugu's prana is fired, these "magical bullets" force into the target the 'origin' of the magus named Kiritsugu. So to speak, one could call it an imitation of a conceptual weapon.

It is classified as both a conceptual weapon and a mystic code.

Source: based on the Fate/Zero description - volume 1 act 3 chapter 1, and the dictionary resource at Jonnobi.