One warning that I didn't notice being covered so far - be careful what solvents you use cleaning your 'new' Winchester. This design has a plastic 'feed throat' at the junction of the magazine and the receiver, and some chemicals can be hard on the plastic. Take a look at http://www.urban-armory.com/diagrams/win1200.htm
, and note part numbers 42102 and 40102 in the drawing to see what I mean. Some people use chlorinated brake cleaner on guns, for example - that's one product you should not use on this one. There may be other solvents that will cause trouble, be sure any cleaning/lube you use is plastic safe. And last time I looked, modern replacement feed throats were available if needed.
Other than that relatively minor caution, you have a really good gun there, and got a really good deal on it IMHO - enjoy it!