Hi everyone, noob here both to the forum and the platform. Had a little problem with my ar front site this am at the range.

First, the particulars. 16 in. m4 profile stag upper with the aforementioned troy sight mounted on the gasblock, no rails on hand guard as of yet. Long and short of it is the post backed out of the Troy and fell out. I found the post and detent plunger but from what I can see it shouldn't have happened? The plunger has a nipple on the end that should index into one of the notches ont the adjustment wheel of the post. So how'd it back out?

Thanks for any input ahead of time.
Chris