Mossberg 185K-A?

I Recentley found my grandpa's Mossberg 185K-A. It seems to be In REALLY good condition. Are these Shotguns worth anything these days? I'm not going to sell it but was wondering if I should put it up as a Collectors item or use it as it was ment too? What can I shoot out of it?(slugs,bird shot,buck)
Update: It's Deffinenty a 20ga. It is Bolt Action which is pretty sweet. I don't know if it has a 4 shot mag or a 2 shot. The mag sits flush with the stock. It has a choke on it. What does the Modifed and all that mean?
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