While carrying a firearm on duty, a correctional officer--
(a) must at all times be alert, and
(b) must maintain the firearm and its ammunition in the condition, and with the safety precautions regarding its carriage, use and readiness to fire, as are approved, and
(c) must not deface the firearm or any of its accessories or ammunition, and
(d) must not make modifications to the firearm or to its ammunition.