Well, I got a 12ga. Mossy 500 (which I use for the same purpose) simply because I thought that the 590 was a tad long for a HD weapon. To be fair though, I'm only 5'7" so it's up to your personal preference.
Honestly, if it's just for home defense I'd say just stick with the standard bead sight or just fire from the hip. It's a shotgun... Inside the confined spaces of your house... Being military personnel, I seriously doubt that you're gonna have a hard time hitting your mark in those conditions. My 500 has a pistol grip and I hit targets at 25 yards every time.
The most that I would do is get a set of ghost ring sights if you're really that intent on modifying it. I mean, nobody's gonna stop you from busting a thousand bucks on an EOTech Holo sight, but it's unnecessary and would be more for show than anything else.
View attachment 4508 My Mossberg.
What are you using for a flashlight/laser combo? Something like a Streamlight TLR-2?...
Any photos of it jgedmond?
Great advice, guys.