A fixed 2x-4x power scope will be bomb proof,inexpensive,and you'll be able to afford a better scope line. You ain't going to need much magnfication with a slug gun anyway.
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Sometimes you earthlings REALLY amaze me!
Stalkingbear does not speak with forked tongue. Get a 2X or 4X fixed power scope. Great advice. I'd look at a Weaver K 4 or a Sightron 2.5 X 32 for example. They are in the $125 range at most places. Good luck.
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If you always do what you always did, you will always get what you always got.
Although a bit more money, the new Nikon Slug Hunter is an awesome choice and certainly a item you should take a serious look at.
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An "archer" tries to see how far away he can get from his target and still connect, a BOWHUNTER tries to see how CLOSE he can get to his!