Is tarnish on the inside of brass barrels an issue?

[Supersai]

Was wondering if tarnish on the inside of brass barrels is an issue and if so how everyone deals with it.

[Toestr]

If it's just surface, it should be fine. A mirror polished bore isn't necessary. If it's thicker (like approaching 1/16") might be an issue because it could act on the ball. If you're shooting it, and nothing seems abnormal, I wouldn't worry about it.

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[Chuck E Ducky]

Leave it, makes the bore more smaller for today’s paint. 🤷🏻

[Knuckle Dragger]

Tarnish is ok, corrosion could be an issue.

[Chuck E Ducky]

Throw a Barrel swab coated in brasso in a drill and shine away. (If it’s lumpy and corroded). If it’s just tarnished smooth I would just leave it alone. Won’t hurt anything may even help.