"Peening" Around the Breech of a vz.82

[Hurryin Hoosier]

I recently received my second vz.82 and noticed something which struck me as odd. I hope that it's not a cause for concern. The breech (that is to say, the portion of the frame which surrounds the breech end of the barrel, itself) looks as if it has taken quite a beating. The barrel seems to be okay, and it shoots and functions fine. Is this anything unusual? I don't know what has caused it. I can't see any signs of "hammering" on the face of the slide. The serial numbers match, and it is the (apparently) original polygonal barrel. This condition doesn't seem to be present with my other vz.82, either of my Makarovs, or my P64. Any thoughts?