I wasn't going to weigh in here, but here goes:
I tend to agree with those advocating no rear sights, but would opt for a tritium or fiber optic front sight. In a home defense situation, the lack of minute focus may negate the fine accuracy gains of a ghost ring rear apparatus, or a rear sight in general. You would be surprised at the number of average folks (with minimal to no training) who never see the rear sights on handguns and rifles in 'high stress-low light' situations also. They tend to look over the top of the gun (which you can still get hits that way, and I have seen trainers that include drills with this style of shooting).But......
If you do add sighting tools to a shotgun (add HD rifle in here to, IMO):
A red-dot with no magnification or a laser may be applicable.
*(I am looking at red/green-dot scopes for my shotguns like I use for my AR HD gun)
My personal preference is a good light, **maybe a dot scope (added for now, while I research dots)** and practice with the weapon.
Practice and familiarity often trumps the gadgets that we often put too much faith in......
JMHO, FWIW.
**Another thing to remember is that at super close range, such as in a SD/HD scenario, shotgun loads rarely open up as much as you think...... At 10', almost all loads will make one single entry hole. It can take up to 20' of distance to actually show a spread of pellets with average birdshot and even farther for loads like turkey and duck..... and buck is a whole other issue.
At short range, a shotgun is not much different than a rifle....except for that whole "hits like a sledgehammer" factor.
