Mossberg 590S Shockwave 51601 12 Gauge

The Mossberg 590S performs almost flawlessly with mini shells, unlike previous factory guns; also allows firing 2¾-inch and 3-inch shells. As a result, this is the most desirable of the shotshell firearms.

The big question is how did Mossberg modify the 590 to feed mini shells successfully in the 590S? It isn’t that difficult because Mason offers a magazine port insert to cure feeding issues.
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