The North Australian Inc. Handcannon is a single-shoot, breech-loaded pistol which fires the 25x163mm anti-air round used by the WW2 era Japanese Type 96. Its action can... probably resist the pressure, seeing as it's almost wholly bluemetal, titanium and tungsten alloy. On the other hand, the shooter's meaty hand has far greater concerns than if the action can hold through, primarily its integrity.

North Australian Inc. Handcannon
Handgun
Abilities
Common Attributes - Mechanical
One-Handed
One-handed weapons enjoy certain advantages; namely, that they can be used while doing something else, or wielding another weapon.
EFFECT:
Two one-handed weapons can be equipped at the same time and used without having to Change Weapon (1 AP).