Chuck,
Actually a 1/4" to 3/8" straight at the end of a Parker choke is pretty normal. Austin has posted here and in the Parker Pages diagrams showing the shape Parker used to achieve the wonderful patterns these gun produce. Of course modern ammo shoots and patterns differently then that which the factory used so as Pete says you really need to pattern each gun with the ammo you intend to shoot to know what the gun will do.
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