peening and wear on underside of upper

[mattal21]

feild strip and cleaned after the first 30 rounds through it and noticed this and was wondering if this was normal.

http://i435.photobucket.com/albums/qq74/mattal21/DSCF0512.jpg

[markm]

I can't see your pic, but I'll bet it's pic of the cam pin cutout in the upper. If so, the wear is completely normal.