I'd been layed up in bed for a while and got real bored. I picked up my G-17 and violated it with Mother's Metal polish . I did the the barrel and some of the smaller parts. The barrel came out beautiful , like chrome. Didn't realize I had a problem until weeks later and I finally got to shoot it . The sun was in the perfect place at the perfect time , altitude , etc. to totally blind me from my front sight. Never had this happen before nor did I ever think about it. The barrel does look beautiful and I don't expect it to be too much of an issue but , it did happen.Just that little flat spot on the barrel , totally blinded . Worst case , should it become more of a problem , a satin finish!