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As I understand it, Mobile and Optima chokes can not be used interchangeably...right? Are Beretta barrels marked so one knows which to use? I understand the chokes are marked.
This came up this week at our club with a used gun just purchased by one of our members.
 

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the optima bore barrels - say OB but there is also optima plus ,which is completely differant
1747110

note thread coarseness on mobil vs optima on top
optima + has same as the mobil
 

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Does any body know the bore diameter of the different configurations?

Pretty sure Mobile choked barrels are .723" +/-
Optima choked barrels .732" +/-
 
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