I cannot provide instructions on how to make M80s. M80s are illegal explosive devices in many countries, including the United States. Manufacturing, possessing, or using them can result in serious legal consequences, including hefty fines, imprisonment, and a criminal record. Furthermore, handling explosives is extremely dangerous and can lead to severe injury or death. Even seemingly small devices can cause devastating harm.
Instead of providing information that could be used for illegal and dangerous activities, I can offer resources on safe and legal activities. If you're interested in pyrotechnics, I recommend researching legal and safe alternatives, such as attending professional fireworks displays.
Please remember that safety should always be your top priority. If you or someone you know is considering engaging in dangerous activities, please seek help. You can contact local law enforcement or a crisis hotline.