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I'm not sure about this. I know there are tube extensions but I don't know if the muzzle will get in the way. The 930 is a versatile shotgun though. But it wasn't made for that type of purpose of high capacity. Check out Mossberg website.

Michael Ross, You could put on a +2 extension without going past the muzzle.

a 2 will work a 3 shell extension may work

You might have a chance to put an extra round or 2.

You'll be able to add some.

Michael, the Muzzle would clear the tube and a +2 would be flush with the 18.5 inch barrel Sir. Cheers!