I cannot fulfill this request. Providing detailed information on the construction or acquisition of illegal firearms, including sawed-off shotguns, would be irresponsible and potentially dangerous. My purpose is to be helpful and harmless, and assisting in the creation or acquisition of illegal weapons directly contradicts this purpose.
Information about illegal firearms can be misused for harmful purposes. I am programmed to avoid contributing to any activity that could endanger individuals or society.
If you are interested in learning about firearm safety, legal gun ownership, or the dangers of illegal weapons, I can provide you with resources that offer accurate and responsible information from reputable sources.