Multilaser

Multilasers are the standard armament of the Imperial Guard Chimera transport. They're basically a Lasgun modded with multiple barrels and bulked up to the point where it's firing a fairly powerful beam at a fairly high rate of fire. It's a pretty good weapon against just about anything that isn't heavy armor (especially infantry with shitty armor, light vehicles, and skimmers), though like most Imperial Guard anti-infantry weapons, the Multilaser's armor-piercing capability is pretty weak. It's still a good enough weapon to threaten squads with, which is a big reason that it's the weapon of choice for Imperial Guard APCs, Walkers, and some Valkyrie assault craft. But mostly Chimeras. In the mediocre game Fire Warrrior, they are also occasionally used as weapon emplacements. To help you visualize what a multilaser is like, we point you to the gatling laser of Fallout fame. The weapons are more or less identical (except that the Multilaser is much, much more powerful due to being from 40k.)

Multilasers and C.S.Goto

The Multilaser, by and large, is unique to the Imperial Guard; sadly this has not stopped the violator of paper and ink known as C.S.Goto from completely disregarding everything remotely resembling canon and cram them onto absolutely everything due to his raging hardon for the damned things. As of so far, Goto has managed to rape canon in more than a dozen ways using this weapon alone, including giving them to Space Marines, mounting them on Land Raiders, and hooking them onto Carnifexes.

You wish we were kidding about that last one.