Got the borescope, this is the one I got:
https://www.amazon.com/dp/B081T1DN1P?ref=ppx_yo2ov_dt_b_fed_asin_title It doesn't have its own screen so I used it with my Windows laptop. I'm pretty happy with it.
Looks like I've got some cleaning to do. I think I read somebody used steel wool, maybe on a long rod with a drill? Anybody have other ideas?
Youtuber Northwestairgun mentioned he used a piloted cutter but I don't have any of those.
Maybe let is soak with some kind of cleaning solvent...?
Edit to add; now I'm thinking I might get some gun cleaning lead remover and put small rag in the end of each chamber, soak the rag and let it sit for a day or so, keeping the rags wet with the solvent. Maybe do the same with other solvent for the non-lead crud.
First image is the air tube, second is the valve chamber.
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