I called customer service and it is basically as Busta says. I was told 47 dollars if I send in my frame for the standard open sights (in addition to the 12 guage barrel cost). My idea is to send in the frame and get the ultra slug 12 gauge barrel installed. I will try it that way for a while, but I am thinking that I will eventually have it shortened to around 20 inches.
I also remember seeing camo stocks on some of 10 gauges. I have the standard black stocks. I may try to obtain a set of those as well. Should be pretty cool looking when all is said and done.
I also read another post about changes for 2008. Apparently they're changing the rifling of the slug barrels. I may wait to see if that occurs and try to get one of the new barrels. I always thought that the rifling in the ultra slugs seemed a bit shallow compared to other 12 guage barrels I looked at (understand that this was just sticking my finger in the barrels, nothing precise).
Thanks to all for the replies.