The choices for full auto airsoft sidearms is not that deep but there are some which will always have a special place in player's heart. In this video, Vroom Productions talks about his favourite ones... "This video is about my experiences with full auto secondary sidearms! The ones I go over are the Elite Force Glock 18c and M9A3, Tokyo Marui Glock 18c and Xtreme, Action Army AAP01, and the KWA MAC 11."

Should you? Not exactly a requirement, but highly recommended that you should have a backup such as a sidearm in case your primary malfunctions or you run out of ammo/gas/batteries. Gun Gamers talk about this in this video... "In this video, Eric discusses if you need a secondary handgun for airsoft use. Hopefully this makes sense."

Punished Props shows you to make a functional airsoft pistol based on the Destiny video game. Prototyping video also included here for you to watch... "Bill converted an automatic airsoft pistol into the Dead Man Walking sidearm from Destiny 2! This video covers finishing and assembling the 3D printed parts."

Footage showing a project of DARPA in action. The SideArm can launch and catch UAVs anywhere... "DARPA’s SideArm research effort seeks to create a self-contained, portable apparatus able to horizontally launch and retrieve unmanned aerial systems (UASs) of up to 900 pounds.