GG IRC might be dead, but I can still draw up and spec out guns the Dogbots might use. In this case, real world autocannons with mounts and casings for individual Dogbot operation. Using such weapons allowed the Dogbots to work with various official agencies and forces while also keeping their firepower at a generally comprehensible level.

M230LF, an extended variation of the Apache's chingun, in a rifle configuration mount for general purpose use. Never actually appeared in GG RP, only thought of it while looking up the specs on the Bushmaster to draw this.
M242 Bushmaster, updated with a lightweight arm brace and debris casing. The original was in an armored underslung mount, and actually saw a lot of use in GG RP, especially the arena, where a lot of people learned to shoot up the ammo boxes.
Mk44 Bushmaster II, in an armored underslung mount. Had planned on bringing this out in GGRP, but never got around to it.