[MPB]

A freeper says they make two cracking sounds. One when it fires and one when the round breaks the sound barrier. Personally I’ve never heard a gun make two sounds but I’m not the expert others on here seem to be. Although I did fire expert with an M16 at 200 yards. Never heard more than one pop per round.

Depends on how far you are from the shooter. If you are the shooter, or at the line, you'll hear one sound (and whatever echoes). If you're down range, you'll hear the bullet crack/whiz by and then hear the report later. Assuming you weren't hit, in which case you may not hear anything.

[Terry Mross]

We took turns firing and “working” the target. I only heard one shot.