The push buttons allow the gun user to operate the gun. Typically two
are used on a FragTag system; one for reloading when you run out of ammo,
and one for changing the firing mode (full auto, single shot, burst fire.)
If a secondary weapon (eg grenade launcher) is fitted, a third button is needed to fire it.
The buttons need to be momentary action, that is the activate only when
held in. They should be mounted in a position that is easy to access,
and we recommend labelling them as "LOAD" and "MODE"
to save confusion.
Example button installations