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For heavy munitions purposes, Merr-Sonn has provided the limited PLX-3MX. This was an unheralded multi-purpose weapon that was quickly superceded in the market by the PLX-4. It is chosen by the ARC teams for its greater portability and expanded weapons load capability. Its complement of three weapons tubes include two "live" barrels and one reserve. It can fire "dumb" missiles that have to be aimed by the trooper, or "smart" missiles that can locate their target based on heat signature, or gravity-activated moed (GAM) missiles. In addition, it can fire chips, or large shrapnel-like projectiles, as well as the advanced Savant anti-air missile.

The Savant missile is known as a "surprise attack" weapon. They appear to be "dumb" bombs to their targets, used only to establish line-of-sight and not dangerous. When a pilot moves to avoid the seemingly dumb bomb, the Savant's internal computer system kicks in after a short delay. The computer then re-establishes its target lock and slams into the target from behind, well before the pilot can react to the new threat.