When there's a problem, the panel observing looks for a way to eliminate ANY chance of issue...so they changed the safety. There must have been more that one instance... I had lots and they had all the different features too, I had to hear this story after the fact. They all worked great. Can't say about the carbines, but we used our selectors(safety)...if you don't have one in the chamber, then it isn't an issue. You can never tell from a picture.