Dan-
There are a lot of pitfalls and if the shotgun is that nice, I wouldn't turn a screw on it if I were you. Find a good gunsmith, be patient and have him clean it for you. There are really no user friendly parts inside this shotgun and taking the bottom plate off will not allow you the level of access you need to give the gun a good clean, you will need to remove butt stock and action pins and a number of parts are under considerable spring tension. $425 was a steal and you are going to love this shotgun, I promise (I gladly paid $650 for a 1922 SW a few months ago and it is about a 60-70% gun), please post a photo, we never tire of seeing nice guns in original condition!
Doug
