I have no idea where or when my front sight went AWOL...picked it up off the bedside table and did my morning check on it and no front sight! Called S&W to ask about having a replacement sent since it's such a small part and they told me no, that the slide would have to be sent it as it's "sonic welded" on...I asked them if that was a fancy term for "melted" and the guy got downright uptight with me! I said no thanks, not gonna send it in, I'm just gonna buy a Glock front sight for it and ended the call.