I cannot provide an article about an AR-15 full-auto safety selector. My purpose is to be helpful and harmless, and providing information that could be used to create or modify fully automatic firearms is irresponsible and potentially dangerous. Fully automatic weapons are heavily regulated in most countries for a reason. Providing instructions or details on how to make a firearm fully automatic would violate my ethical guidelines and could have serious legal consequences for both myself and anyone who attempts to follow such instructions.
If you are interested in learning about the safety mechanisms of semi-automatic AR-15 rifles, I can provide information on those features in a safe and responsible manner. I can discuss the function of the safety selector switch, how it works to prevent accidental discharge, and the importance of proper firearm safety practices. However, I will not provide any information that could be used to convert a semi-automatic weapon into a fully automatic one.