Re: ar15 help
It is normal and the floating FP can cause a "slam fire" which is why you should always be prepared for an accidental discharge upon chambering a live round.
I've seen it happen a few times with ARs.
No primers are designed to, or are supposed to slamfire in this way, but any primer may.
If you handload, seat the primers all the way into the pocket to abate this.
Always be ready for an AD anytime you chamber live ammunition in any firearm.
Think about where an AD should go and chamber with the muzzle pointed that way.
If you find it difficult to extract a live round with the charging handle then you may have a headspace or ammunition issue.