Welcome to SR. I'm sorry you have been dealing with this. The question in my mind isn't so much whether HE has hit HIS bottom, have YOU hit YOURS? Living with an alcoholic can be a nightmare, but when guns are involved, it is insanity.
I urge you to do whatever is necessary to protect yourself. The next bullet could very easily hit you. Don't stick around and wait for it to happen.
I suggest you post in our Friends and Family Forum. There are many people there who are dealing with or have dealt with an alcoholic. You'll find a lot of support. Here's a link...
Friends and Family of Alcoholics - SoberRecovery : Alcoholism Drug Addiction Help and Information