Jerry you know more about these than I do, but take a HOT that does not return to safe after firing one barrel, push the trigger forward sometimes you will hear a "click", then try pushing the safety back to safe.

Many years ago I answered a post about HOT's not having a auto-safety feature and a gentleman wrote and sent a picture of his Specialty Grade that did have this feature from the factory. I have the picture some where but having difficulty finding it.