The "Photonix" automatic laser carbine was designed by the Eisenwolf to arm the city guard of Fair Haven. It trades a bit of reach for a massive improvement in firepower, setting basically everything it hits ablaze. In oder to do the, the Eisenwolf swapped the standard laser emitter system in an automatic laser barrel with three subcompact laser arrays he rebuilt from standard laser rifles scavenged from various pre-war outposts. The most notable change was the addition of a heatpipe-based cooling jacket, which keeps the emitters at optimal temperatures even under severe conditions, making the Photonix superior and massively more durable than its army counterpart.
However, the three independent barrels required more energy than even an overcharged capacitor could possibly provide, so he had to replace the standard capacitors in a common laser receiver with three makeshift capacitors strapped to the right side of the receiver. And because normal fusion cells were actually too weak to provide enough energy for a sustained firefight, the receiver was also mmodified to accept a new energy storage unit dubbed the fusion capacitor (or F-Cap for short). These little micro fusion reactors filled the gap between the fusion cell and the larger fusion core, however they had the advantage of being rechargable with a mixture of Deuterium and Trition, which could be created from water with the help of a portable recharger kit.
People may wonder why the iconic green casings were replaced by thin wooden slabs and if these could catch fire, but this is not an issue at all. The standard frame of the AER12 was covered by a thin layer carbon-fiber, which only was good enough to protect the internal parts from the elements. The wooden slabs actually slightly improved the weapon's static properties, which contributed to the Photonix's overall sturdines. And as with its predecessor, the emitting parts of the weapon are still encased in a stable titanium frame, which conducts the remaining heat the heatpipes didn't take care about away from the core, keeping the operating temperature even way below the point when the wood begins to char.
This 30k polygon monstrocity took me forever to flesh out of a common AER12 automatic laser rifle, but it totally was worth it.