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Certain 391 field models came with optima plus chokes. I have owned several.

If the barrel has a narrow rib and doesn’t say sporting it could be optima plus. There was a time when 391s used Mobil. Optima plus, and optima. The optima (with the threads at the end of the barrel) were in sporting (wide rib) models.

Not one of Beretta’s best marketing moves to use the same name for 3 different choke systems.
 
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