I've never seen one of those before. That is pretty neat.
Still, all of that is a far cry from actually building a weapon from scratch. My long-term objective is to scratch build everything, including the barrel. It won't be an AR15 since that is actually way beyond a scratch build in a manual shop.
You are going to build a barrel? Well we know you can grow some good weed for sure. You should do a Youtube on why you should not smoke dope.