Didn't want to clutter up this forum with multiple single threads so opting to create one general thread.

Questions are obviously related to 3-gun activities.

Is there a minimum barrel length that one wants? A number of shotguns come with 18 inch but seems like 24 and up is the minimum one wants.

If looking at a Benelli M2, is any M2 ok or should it be the M2 Tactical? The standard M2 is about 1/2 the price. Obviously a standard M2 would have to be upgraded.
Is it cheaper to get a standard M2 and upgrade or just go with the M2 Tactical?

Is the standard stock or pistol grip more favorable?

Is it easy to attache a fiber optic front sight on shotguns if it doesn't already have one?

What size mag tube extension is common? If you get a +8 is there a minimum barrel length one should have?

non pistol grip, ~24" barrel, 12 round magazine,