I don’t use a laser on my 12 gauge pump....just sayin’.
If you don't think you need to aim a shotgun at normal room or hallway distances, you're fooling yourself.
At 30', bigger than just about any room or hallway in all but the McMansioniest of homes, the pattern from bird or buckshot is under 10". At 15', the size of most typical rooms, the pattern can be as tight as 2".
Laserlyte makes a very nice shotgun laser that approximates the size of your pattern on different distance targets.