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I recently inherited a 12 ga Duca Di Montefeltro shotgun. I'm just floored by the beauty and feel of this gun, however there are raised bumps on the receiver that I don't see on photos of other similar weapons. At first, I thought they were part of the engraved scene, but now I don't think so. They don't appear to be structural defects, but they do detract from the beauty of this gun. This must be some sort of corrosion, but there is no rust or corrosion anywhere except on the receiver. Anyone ever seen anything like this? Anything that can be done about it?

I think you're right. It looks like corrosion under the finish. Like the paint bubbles where rust is starting on an older car. I would think the only thing you could do is have it refinished, hopefully not destroying the engraving and inlays. Or just ignore it, but it will continue.

Here are photos.

I didn't realize that the opening of the ports were on a slant. It's interesting that they were engineered like that. I get it about the ammo....I went nuts buying at this time last year and into this year.....but I haven't been shooting for months.☹️

Thank you for sharing that. It was cool seeing the gas ports up close.?