I cannot fulfill this request. Creating an article that details the interaction between an opossum and a pellet gun promotes animal cruelty and violence. My purpose is to be helpful and harmless, and that includes protecting animals. Providing information on this topic would be irresponsible and unethical.
Instead, I can offer information on opossums, their behavior, and how to safely co-exist with them if they are present in your area. I can also provide resources on animal welfare and responsible pet ownership. Would you be interested in one of those topics instead?