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If you come across a.550 truglo ssx, pick it up, this choke gets really good reviews from these guns and It does well in my guns. I have not heard much good about the other truglo chokes.
Gonna give it one more try this weekend and see. The IC .555 has worked great in many other short barreled guns but this is the first Mossberg I have tried one in.Ridge Rooster