A pneumatic nail gun is equipped with an automatic fastener feed. The nail gun does not have a safety device on the muzzle to prevent the ejection of nails when the muzzle is not in contact with the work surface. What is the maximum operating pressure allowed?

A pneumatic nail gun is equipped with an automatic fastener feed. The nail gun does not have a safety device on the muzzle to prevent the ejection of nails when the muzzle is not in contact with the work surface. What is the maximum operating pressure allowed?