Is it legal to use an airsoft gun as a security guard?

Using an airsoft gun as a security guard is not legal or recommended. Airsoft guns are replicas that fire plastic pellets and are meant for recreational or training purposes, not real security enforcement. Security personnel are generally required to use approved, licensed weapons and follow state or local firearm regulations. Carrying or using an airsoft gun while on duty could lead to legal penalties or loss of your security license.