TexasCHLforum.com

In a sense, I can see that in a typical single action semi-auto pistol with a round in the chamber, there are springs and such that are compressed and waiting for opportunity to let go and strike the primer (except for double action types). However, there has been lots and lots of testing and experience (and design) that says that doesn't happen even when they are dropped. Just about every story I have heard involves someone messing with the trigger.