New Norinco M305

I was cleaning my M305 the other night and noticed a groove on the frame just to the right of the bolt. Looks like it's caused by the right bolt lug. Just wondering if it exists on other M305 rifles. Can those of you who have one tell me if your rifle has a groove here too?

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Thanks, Barney!

Would it be worthwhile to gently file down the bottom edge of the right bolt lug to round it out (to reduce wear) or don't bother?
 
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