So I noticed upon inspecting my BCM midlength upper that the gas tube at the very end has some shiny wear marks at the very end of the tube. I checked the gas block alignment and it is perfectly straight, I also did the gas tube alignment test by taking the bolt out of my bcg and letting it slide home under its own weight and it went in just fine with no binding. I’m just curious if this is normal or should I be worried?

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This upper is a complete BCM upper with 270 rounds through it with no malfunctions, I should also point out I have another BCM upper that shows the same thing with around 800 rounds again with no malfunctions. So is this normal? Thanks for any input.