I see little need for a laser on a HD shotgun, but if you do, get a cheap green one, fire 20 rounds of heavy loads with it installed, and if it holds up you're good to go.
However, stockless shotguns work way better in the movies than in the real world. Using one is a serious disadvantage even if all your firefights take place in phone booths.
My defensive 870s are accessorized heavily, except for one that does double duty as a waterfowler. With a 21" barrel and zero addons, it's snake fast and very effective.
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