Keep it, its one of a few Mossberg semi's out there. And they work well.Not worth a lot on the market, but ask most owners, they wont get rid of them.
I found that if I use full power loads, I have no problems with mine. I have a 5500(forerunner of the 9200)w/a 24 in cylinder bore barrell with tritium rifle sights. I did the same thing. Tac'd it out.
Now I have to tell you, good luck finding a side shell carrier. I had to make mine out of a Redfield scope mount that I cut down and attached the carrier to with rivets.
As far as stocks or parts, go to the Mossberg collectors society. They have green and black synthetics for it.(Shameless plug- I have a set of walnut stocks that'll fit your 9200 for sale in shotgun parts forum if you want stock set to mess with,paint,etc)
They didnt make a barrell under 24 in. for this gun,Unless you can find a jungle gun barrell,( highly unlikely) so a gunsmith might be useful in that respect.
Choate makes mag extensions and a pistol grip stock as well(but why go that route? You wont be able to activate the safety without losing your firing grip.)
Also, Mossberg sells their ghostring sights as an aftermarket part kit. Contact them and they'll help you out. Hope that helps!