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That gun will shoot slugs as it is. Get rifled slugs for a smooth barrel. Federal "tactical" slugs are a great choice and easy on the shoulder.
If it has a factory extension (a wee bit smaller at the tip) it should be a +2 for the 18" barrel, probably cylinder bore which will pattern wider than you'll want for recreational shooting but is perfect for HD.
I shoot my 870's with a 20" barrel with an Improved Cylinder choke which is only slightly more restrictive than your cylinder bore and it's a blast.
Soon the advice to buy lots of ammo and practice, practice, practice will be coming.
I would pay heed to that, not that you will have any trouble motivating yourself to go out and shoot! 870's rock!
Mike
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