barrel options on marine magnum?

[speed]

Is there such thing? I am a novice and don't have a good understanding of replacing and or changing barrels on shot guns for specific puposes.
Can one shotgun do it all?
How bout the marine mag ? ,I like the idea of low a maintnance shotgun but I wonder if this model has limitations I am unaware of?

[DML]

There is no reason why you couldn't use any barrel that fits any 870. Of course, it wouldn't be plated. Actually, some people think it looks kind of cool. One customer sent his extra barrel to Robar so it would be rust resistant.

One thing I should mention since you say that you are a novice is that you will need another magazine cap and a shorter spring of you want to use your gun for hunting.