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940 tactical mag extension


.270 WIN
For anybody who has the 940 tactical model. Could you measure the overall length of the mag tube extension? I am looking for the length from the bottom of the nut to the end of the extension.
I don't know, as this is my first time working with Mossberg semi-auto shotguns.

Here's a few quick pics of the mag tube length:
I have 6 7/10" from the bottom of the mag tube nut to the end of the tube.