I came across a Stevens 77 12ga shotgun (actually a Savage) and am looking for a blowout of it so I can break it down an clean it. I couldn't find the serial number any where on it and would like to some some history on it. It has an adjustable choke but I can't get off. It's also got a lot of rust on the outside but I haven't checked the barrel yet. I tried the google search but didn't come up with anything worth while.