Thanks for the advice, folks. I really appreciate it.
If I mount a 6P to my little "riot gun", you can bet that it will get at least 100 test rounds of 1 oz. slugs fired through it to make sure the setup is reliable.
I own several handguns, several rifles, and this shotgun. I load my own ammo for handguns and rifles. I don't train like a SWAT Team member, but I train enough to defend myself and my family.
The shotgun's primary purpose is home defense, and I believe it will suit that purpose better with a light mounted on it. Don't worry, I'm doing my homework, and I don't trust my life to any gun that I haven't fired a whole lot of rounds through.
If the light doesn't hold up under fire, while lit before and during the strings of fire, then I'll step up to the next level.
In a true home defense situation with a shotgun, I don't expect the weapon-mounted light to remain on for any length of time.
I have other security items in place to prevent such things before it comes down to firing a gun in defense. It's a last resort option, but one that I won't hesitate to use.