I recently went to my range to fire my .45. Gun is only about 4 months old. While firing I noticed something white flash past my right ear. When I checked the gun rear sight I noticed the left side white dot was AWOL. I called Springfield and they suggested I get some Testors model paint. I did and dropped in a blob of white paint into the hole with a toothpick. Worked great. All is well. Just wondering if anyone else has experienced this with their XDm. Company said they had not heard of this happening in the past.