p226 frame wear

When cleaning my Sig P226 Mk25, I noticed that there is what looks to be significant wear on the underside of the right slide rail on the frame. The anodizing on the frame has been worn through. The underside of the left rail looks fine, as does the top of both rails. See picture below...

I'm new to this forum and unfortunately found it after searching about a problem I have with my P226R originally chambered in 9mm. I ran about 300 rounds of Speer lawman 9mm through the pistol. I love the gun and wanted one in 40sw for a backup to my rifle when hog hunting. I called Sig and...