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I've got a duckbill on a Mossberg. Mine was put on by Great Lakes Armory. This is the company talked about in SAR.
In my patterning with and without the duckbill there's not really much difference in the pattern at typical room distances. There is a very noticeable difference at around 15 yards though. The pattern, at around 15 yards is about twice as wide as a regular barrel (Imp Cyl) and only half as tall. In other words, the duckbill pattern was around four and one half to five feet wide and only around a foot and a half tall. Very even pattern with no holes. Much more even than the same barrel was before the conversion. HTH
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