I have a standard size M&P 45 and have a small problem with the front sight. The white dot is gone, apparently it's some type insert that's glued into place. Had it out last week to put some rounds down range and noticed that it had gone bye bye when I got home. The sights are factory and AFAIK are not glow in the dark type. I can still use the sights as is but it does irk me that the insert fell/flew off the sight. I debating on whether to send it back for repair or leave it be. Opinions please and has this happened to anyone else.