I normally would say something to the effect that this is a tool and I don't care about scratches but this is on the barrel and it routinely has ~35000 psi pushing a projectile ~1100 fps through it.
Can you comment on how deep the scratch is in the barrel? Can you feel it with your fingernail? Is it deep (think like a vee carved into the barrel) or is it just a superficial blemish that took off the coating? If it is deep, you may want to consider sending it in as it may fatigue over time into a crack. How sharp the scratch is actually could matter.
Best of luck!
Cheers,
Toby