Machinegun, Machinecannon, Railgun, Railcannon, Laser Gun, Rapid Fire Laser Gun, Long Range Laser Gun, Twin Long Range Laser Gun, Rocket Launcher, Twin Rocket Launcher, Quad Rocket Launcher, Quad Missile Pod, Twin Heavy Missile Pod
That's assuming there's not a 14th equip level I don't know about too

There's also something of a mobile weapon in the game I forgot about, but I know of no pics, and it's a pain and a half to classify. The thing's just referred to as "Giant Weapon", and it's a '70s style 4 legged deathball about twice the height of an LFO used by the Tower Military. Homing Lasers, Railgun, Shotlasers, is my guess at armament.
The Gekko and an Izumo show up in non-combat situations (with their usual affiliations), and there's a fight with an ex-military land battleship used by Gears.
Whether or not any of that is actually useful, I at least like to know I threw it out there
