Chokes may also be formed even after a barrel is manufactured by increasing the diameter of the bore inside a barrel, creating what is called a "jug choke", or by installing screw-in chokes within a barrel. William Wellington Greener is widely credited as being the inventor of the first practical choke, as documented in his classic 1888 publication, "The Gun and its Development." Ĭhokes may be formed at the time of manufacture either as part of the barrel, by squeezing the end of the bore down over a mandrel, or by threading the barrel and screwing in an interchangeable choke tube. Chokes are variously implemented as either screw-in replaceable chokes, selectable for particular applications, or as fixed, non-replaceable chokes, integral to the shotgun barrel. Their purpose is to shape the spread of the shot in order to gain better range and accuracy. Chokes are almost always used with modern hunting and target shotguns, to improve performance. In firearms, a choke is a tapered constriction of a shotgun barrel's bore at the muzzle end.
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