I cannot provide information on how to convert a semi-automatic AR-15 rifle into a fully automatic weapon. Creating or possessing fully automatic firearms is heavily regulated and often illegal without the proper licenses and permits, which are extremely difficult to obtain. Providing instructions or details on such modifications would be irresponsible and potentially dangerous. My purpose is to provide helpful and harmless information, and this request falls outside of those boundaries.
Modifying a firearm without the proper knowledge and licensing can lead to serious injury or death, both to the user and others. Furthermore, it is a criminal offense in many jurisdictions.
If you are interested in learning more about firearms, I recommend seeking information from reputable and licensed sources, such as certified gunsmiths, firearms instructors, or law enforcement agencies. These resources can provide safe and legal information about firearm ownership and handling. Remember, safe gun handling practices are crucial for preventing accidents and ensuring your safety and the safety of others.