Odd stripes on bolt, what caused this?

[browningautorifle]

If you look closely you can often see the machine marks on the bolt and they run along those lines. I'd expect the finish has just been scrubbed off.

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[bczandm]

If you look closely you can often see the machine marks on the bolt and they run along those lines. I'd expect the finish has just been scrubbed off.

I ended up purchasing this carbine. It's not what I thought it was as the barrel is import marked but the price ended up lower than I thought. I'll keep it and play with it for a while, it will be my shooter.
Regarding the bolt it's exactly as Jim noted (Thanks Jim!!!) it's the machine marks on the bolt. Overall it's not in bad shape, we will have some fun trying to wear it out!!

Bob