The duties of a part-time armed security officer focus on providing security for a facility, an individual, or a business. You accomplish your security responsibilities while carrying a firearm during your shifts. A part-time security guard ensures the safety of a facility during overnight or weekend shifts or as a substitute for full-time security guards. You perform patrol duties while safely carrying your weapon or ensure the safety of a client. In the event of a security breach or imminent threat, you counteract the issue and contact relevant police or law enforcement agencies.