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My 870 Police shotguns have Fixed Improved Cylinder chokes. Instead of squeezing ... I went with Federal ammo that uses the Flight Control Wad .... or Hornady ammo that uses the Versatite wad.
Easy solution to tighten buckshot and bird shot patterns ...
Everyone that uses a 590 for competition shooting has the barrel threaded for chokes.
It's simply a "must have" for knocking down heavy steel plates with bird-shot.
Tactical Ordnance is one place that does it. It's not crazy expensive.