emjimb,
First, the most valuable tool you can add to a defensive shotgun is a flashlight. It allows you to see your target in low/no light environments so that you can determine if you need to shoot or not.
Second, at the close ranges that you're anticipating a laser that is the least little bit off-axis or offset from the centerline of the barrel will deceptively throw your aim off instead of aiding you.
Third, a shotgun pistol like this is very difficult to use with any accuracy. It's advantage is the comparative light weight when stacked up against a sledge or breaching too. It's use as a defensive weapon is highly debatable. The 18.5" stocked weapon is much more managable and can be aimed with better accuracy. And while shot patterns do spread they don't have much more than an inch spread per 3 ft. of range. At room and self defense ranges the 3 inche patteren still requires the use to point with accuracy.
Don't loose your cool when people seem incredulous over very specialized firearms like this. The breacher is almost more tool than weapon and as such may seem the logical self defense tool on first examination, but falls short of the same barrel/receiver with a standard or youth stock.