I've owned 3 of these guns and my buddy has 2, currently have an SKB model 1900 DU which is pretty much the same gun with 3" capability and choke tubes.
We had the barrel opened up to modified choke by a gunsmith and shoot steel shot with no problems and great success.
The ones I've bought have all been in excellent condition, priced from $400-$500 (the DU gun I have now was $600, just bought it on the site a few months ago). Great guns.
If you ever need parts, try Ron Sharp of Sharp's Guns Ltd. in Dunnville, Ontario. 905-774-6368. He told me the only part that ever needs replacing is the spring in the buttstock, about $20.
Enjoy the gun, I plan on using mine for upland and as my backup to my Browning A5 for waterfowl.
Dan