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Powerhead
A powerhead, bang stick, smokie or shark stick is a specialized firearm used underwater that is fired when in direct contact with the target, not to be confused with other types of underwater firearms which fire specially designed projectiles and do not require direct contact with the target. Powerheads are often used for spear fishing and against sharks or alligators for sport, defense, or to kill nuisance animals. The term powerhead refers to the firearm-like part of the device; when attached to a shaft to form a spear, it may be referred to as a bang stick or shark stick. The spear in question may be handheld or launchable from a spear gun.〔(【引用サイトリンク】title=FreeDiveList FAQ )〕
==Design==
A powerhead consists of a long length of tubing which is the chamber for the cartridge, a firing pin to fire the cartridge, and usually some form of safety pin or latch that prevents firing when it is engaged. The rear of the power head is fitted with some provision for attaching to a spear.〔
Powerheads are available that chamber a variety of handgun, rifle, and shotgun cartridges, from .22 WMR to 12 gauge and larger. .357 Magnum is probably the most common, as it is fairly powerful yet still compact enough to be used in a spear gun. Large cartridges such as the 12 gauge are generally only used on a handheld spear.〔
Some powerheads use the cartridge to propel a barbed spear point into the target. These are generally used on a bangstick for alligator hunting, to secure a line to the alligator to prevent escape.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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