My CMP M1D receiver shows the specks as shown in the picture. To the naked eye they are hardly visible. But as shown in the picture blown up several sizes they are there. What causes them? THANKS
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My CMP M1D receiver shows the specks as shown in the picture. To the naked eye they are hardly visible. But as shown in the picture blown up several sizes they are there. What causes them? THANKS
Refinished during rebuild over light pitting.
Looks like light rust to me
Is it only the heel? Was that an annealed receiver?