ARM-1

The ARM-1 is an Acadian handgun that is intended to be mounted on one's arm. The demand for an arm mounted weapon came after the Acadian combat engineers had difficulty using their standard issue FN P90 weapons while also doing their technical work in combat. Because the 5.7x28 mm cartridge was in production at the time of design, the cartridge was not changed.

Since the ARM-1 was released, many variants were released. Since the weapon is easily customizable, most of its users have come up with their own modifications. The weapon was later developed into the ARM-2, which is a double- or quad-barreled version of the ARM-1.

Characteristics
Designed to be mounted on the right arm of the user, the ARM-1 can be easily folded when it is not in active use. The mounting system covers the user's arm from the wrist to elbow, distributing the recoil across a wider area in order to give the user better control while firing. If better control is needed, the ARM-1 can be detached and used as a handgun.

The ARM-1's cold weather performance is very questionable and external heating is often required to keep the weapon in operable condition. To avoid damage to the weapon when firing, the amount of powder in the standard cartridge was eventually reduced, turning the ARM-1 into a close-range weapon.