Mercury Arms is a publicly owned arms manufacturer based on Mercury. The vast majority of the weapons and ammo that Mercury Arms produces is built by prisoners from the Solar System
. The company supplies roughly 40% of all of the UEC military's guns and ammunition.
- MA45 - A sizable pistol chambered in .45AP, the MA45 is a reliable spacefaring weapon used by civilians and military personnel alike.
- MA556A - An automatic battle rifle that fires the 5.56×45mm NATO cartridge, an old but reliable round.
- Dobroslav WS - The official sniper rifle of the UECA, the Dobroslav is named after a prisoner who invented the rifle and the high explosive sensor rounds that it uses.