I'm looking for recommendations for a good borescope under $100-200, opinions on rigid vs. flexible cables, brands to stay away from, and any other information that may help.

I have an old Enfield SMLE and no matter how much i brush the bore there is still some crap inside and i can't figure out what it is.
also the grooves/lands aren't very defined so I want to know if the bore is shot out, which would seem weird because I would think that it would be hard to shoot out the bore of an old milsurp bolt gun but maybe not.

anyways, I want to be able to see and diagnose bores so would appreciate some feedback on borescopes I should check out.
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