I purchased a Weatherby Athena (SKB gun) used. It's in really great shape but I know nothing about the interior of the action. How often does that need to be attended to, cleaning, lubrication, etc? I do the maintenance on all of my guns but have never done a O-U shotgun. If I open the cover, will anything come flying out? I would like to look in there. BTW, I have NO gun shops remotely close to me right now or I would just take it there.