Discharge of an Air Pistol

A great­ly simplified sketch depicts a loaded "air pistol." The chamber of the pistol contains air compressed to 3 MPa. The "trigger" is a pin that constrains the bullet in the barrel. When the pin is pulled, the bullet is released and the compressed air expands to expel it from the barrel into the surrounding atmosphere. Use the data of the sketch. Calculate the theoretially maximum velocity the bullet might attain.