I'm glad he's behaving himself and hasn't destroyed any more of your property or exposed you to his guns or drugs lately. I'm glad you are staying out of his house and out of that aspect of his life. It sounds like he's a bit dangerous when he feels threatened.
I hope he doesn't hurt anyone or himself with his new car. It takes what it takes though.
Please take care of yourself and don't be deceived. If he is truly doing as well as you describe - traveling, buying cars, and living the highlife, he's a long long way from his bottom. And the only things two things that are always true about addiction is that it is progressive and if the addict doesn't quit using and find recovery, it ends in jails, institutions or death.
Unfortunately addiction doesn't spontaneously get better, it's just that at some times people are better at hiding it than at other times.