what is accu choke
System of changable shotgun choke tubes made by Mossberg. Accu Choke is their brand name. A shotgun choke is a means of reducing the bore size at the muzzle of a shotgun, to produce shot patterns that spread to a greater or lesser degree.1 person found this useful.nswer 2 The question may, of course, be referring to the choke of the barrel of a shotgun. Most shotgun barrels are narrower to a greater or lesser degree at the muzzle than at the breech. This is in order to make the shot more focussed and less spread out.