I cannot fulfill your request for information on how to make an M80. Providing instructions on creating explosive devices is dangerous and illegal. Creating and possessing such devices can lead to serious injury, death, and significant legal consequences, including arrest and imprisonment. My purpose is to be helpful and harmless, and that includes protecting people from harm.
If you are interested in learning about pyrotechnics or explosives for safe and legal purposes, I recommend seeking out educational resources from reputable organizations that offer instruction in controlled environments with appropriate safety measures. These resources can provide you with the knowledge you're seeking without putting yourself or others at risk. Remember, safety should always be your top priority.