For me the most common problem at my local outdoor range is people touching their guns or adjusting their sights after a cease fire has been called and people walk down to check their targets. They always say something like, "it's not loaded", or they "took the bolt out", or sometimes the gun is loaded, with a round in the chamber, and they just put the safey on
! How hard it is?
When people are down range checking targets your gun is unloaded, safety on, and you don't even touch it!