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A captive bolt (also variously known as a cattle gun, stunbolt gun, bolt gun, or stunner) is a device used for stunning animals prior to slaughter.
The goal of captive bolt stunning is to inflict a forceful strike on the forehead with the bolt in order to induce unconsciousness. For the non penetrating bolt gun variation the bolt may or may not destroy part of the brain while brain tissue is always destroyed with the penetrating bolt gun.
The bolt consists of a heavy rod made of corrosion-resistant alloys, such as stainless steel. It is held in position inside the barrel of the stunner by means of rubber washers. The bolt is usually not visible in a stunner in good condition. The bolt is actuated by a trigger pull and is propelled forward by compressed air, a spring mechanism, or by the discharge of a blank round ignited by a firing pin. After striking a shallow but forceful blow on the forehead of the animal, spring tension causes the bolt to recoil back into the barrel.
The captive bolt pistol was invented in 1903 by Hugo Heiss, former director of a slaughterhouse in Straubing, Germany.

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