|
BB guns are a type of air gun designed to fire spherical projectiles similar to shot pellets of approximately the same size. Modern BB guns usually have a barrel with a bore and caliber of and are available in many varieties. BB shot for modern BB guns is usually steel, plated either with zinc or copper to resist corrosion, and measure in diameter. Some manufacturers still make lead balls of slightly larger diameter and which are generally intended for use in rifled BB gun barrels. The term BB gun is often incorrectly used to describe a pellet or air gun. Although in many cases a BB steel ball can be fired in a pellet gun, pellets usually cannot be fired in a gun specifically designed for BBs. However, many air gun models using plastic ammunition allow for use of both types. == History == The term "BB" originated from the nomenclature of the size of steel balls used in a shotgun. BB sized shot was normally , but tended to vary considerably in size due to the high tolerances in shotgun shells. The highest size shotgun pellet commonly used was named "OO" or "double ought" and was used for hunting deer and thus called "buckshot." Around 1900, Daisy, one of the earliest makers of BB guns, changed their BB gun bore diameter to , and began to market precision-made lead shot specifically for their BB guns. They called these "round shots", but the "BB" name was already well established, and everyone continued calling the guns "BB guns" and the shot "BB shot" or just "BBs". Subsequently, the term "BB" became generic, referring to round shot of various calibers and materials. This includes bearing balls, plastic round shot (such as used in airsoft), 0.177 caliber lead and steel shot, marbles and many others. It should also be noted that the ubiquitous usage of the term "ball bearing" for any steel ball is technically incorrect. A ball bearing is a mechanical bearing using bearing balls. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「BB gun」の詳細全文を読む スポンサード リンク
|