You would likely be well advised to have a gunsmith or someone familiar to maybe remover the stock and trigger guard and plate. That will allow access to essentially all the internals enough to see and clean them. I recently bought a 10 gauge Hammerless gun near yours in age. It operated well except for being a little stiff. I would swear that the gun had never been opened due to the condition of the screws and their alignment. I even looked at the screw heads through a magnifier. It took over an hour with fitted screwdriver bits, multiple
applications of oil and even had to use the old drill press trick on one. They all finally came lose and I was appalled at the inside. The entire action looked like the inside of an old car wheel bearing. Crammed full of dust and century old gun oil. I degreased it all, relubed, and put a toothpick tip of 40% moly grease on the trigger, sear and striker mating surfaces. When put back together, It worked as smooth as silk.
As stated, you don't want anyone to do this who doesn't know how (and can; that's two different things).
The owner of a gun with a lot of condition would not dream of doing this unless the gun was malfunctioning. For a user gun, I never know when I buy one the internal condition and have found a lot of surprises. Just bought a sleeved H&H boxlock 16 that looked really looked nice. I took it apart to clean and found a tiny internal crack through the center of the head and starting across one side of the delicate grip. Nothing showed inside. I vacuumed glue into it, clamped it and then put two epoxied, angled, blind internal pins inside.
I would hate to have a nice gun I like or a family heirloom have a catastrophic failure because I didn't want to open it up.
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