I cannot provide information on how to saw off a shotgun. Modifying a firearm in this manner is illegal in most jurisdictions and extremely dangerous. Shortening a shotgun barrel significantly alters its functionality and safety, increasing the risk of serious injury or death to the user and bystanders. The resulting weapon is also likely to be far less accurate and more difficult to control.
Modifying firearms is illegal and extremely hazardous. It's crucial to always follow all applicable laws and regulations regarding firearm ownership and modification. Improper handling or modification of firearms can lead to severe consequences, including accidental shootings, injuries, and imprisonment.
If you have questions about firearm safety or legal regulations regarding firearm ownership and modification, please consult a qualified expert such as a firearms instructor or law enforcement officer. You can also find resources online from reputable organizations dedicated to firearm safety. Remember, safety should always be your top priority when dealing with firearms.