How many rounds is too many rounds down the barrel of a used pistol?

[MarkCO]

For any decent gun like a Glock or similar? Quarter million maybe? I NEVER ask for a "round count" as most people can't afford enough ammunition to substantially harm the gun.

Might be different for some of the heavy magnum calibers and handloaders.

Polygonally rifled barrels, yeah, round count really does not matter. When you go to a conventionally rifled barrel in .40 S&W, life is about 100K +/-. Add for lower pressure rounds and subtract for higher pressure rounds. In a magnum revolver, I'd be more concerned with timing than round count because they don't get shot that much, but maybe 30K is the life with several variables.

Maybe once you pass 10K you start to consider how many rounds you are likely to put on it and the lifespan of the barrel. Depending on that, price may be looked at a bit closer as far as deal or no deal. If you want to sell me a $500 .357 Magnum with a shot out barrel for $5, sure, cause it will cost me $400 to rebuild the thing. If you want to sell me a $1500 .38 Super 1911 with a shot out barrel for $900, that too might be okay cause I can rebarrel it for $250 or so. NOT offers, there, just examples.