Pretty sure the versa max tac comes with a plus 4 nordic tube with mxt nut from factory.
Being that the shotgun is e cat you can do one of two things
1. Buy (from me ha) a plus 1 or plus two END CAP. This simply replaces the nordic mag cap and increases the capacity 1 more or 2 more rounds. It will run with the factory spring just fine. A nordic plus two TUBE will reduce your current capacity as a Plus two tube has a capacity of two more than the forearm
2. From brownells or nz guns etc buy a plus 6 or 7 or 8 nordic mxt tube as it will thread straight onto your forearm mxt nut. If you run a barrel clamp changing your mag capacity takes a lil longer this way than a screw off cap ext.
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