Ialdabaoth, on 24 March 2013 - 10:43 AM, said:
Just make it a 10-slot weapon and the CAT can mount one per arm.
Except it's a 15-slot weapon, and PGI has thus far shown a determination not to change weights or critical space requirements from BT canon.
Even the CPLT-C3 Catapult, which mounts an Arrow IV system, splits the weapon between the Right Torso and the Right Arm (and only carries one ton of ammo).

Additionally, it should be noted that there exist several alternate Arrow IV munitions:
- Air Defense Arrow Missiles (implied to be some form of shrapnel/"flak" round): introduced in 3068
- Arrow IV Homing Missiles: recovered in 3045
- Arrow IV Non-Homing Missiles: recovered in 3044
- Cluster Arrow Missiles (standard bomblet dispenser): recovered in 3047
- Illumination Arrow Missiles (flare dispenser): recovered in 3047
- Laser-Inhibiting Arrow Missiles (dispenses a cloud that reduces the damage of any laser (and only laser fired into/through it by 2): introduced in 3053
- Inferno-IV Missiles (incendiary bomblet dispenser): introduced in 3055
- Smoke Arrow Missiles (smoke screen dispenser): recovered in 3044
- Thunder Arrow Missiles (landmine dispenser): recovered in 3051