Need Sights

I e-mailed TDI asking about choke or pattern size distance recommendation.  I'll be attending their Tactical Shotgun class this summer.  The largest choke tube I have was suggested because defensive use is always close.

I was also told that slugs will be at ranges up to 100 yards.  Shooting with just a bead won't work that far away for me.  I don't intend to ever shoot slugs out of that gun after the class, so I think I'll put on a set of clamp on sights.