More guns is awsome idea, I'm a gun lover,but I would focus more on balancing and bringing some use for guns we have already. Anyway having some alternative for avenger would be nice, something with less spread and lower splash, but still useful with hexing. Something with one barrel like M60 but on higher tier.
Unfortunatelly I voted for Tesla gun, it should deal electric dmg...we really lack this type of weapons (electric,fire dmg)
Edit.:I didnt saw Prebas post, but well said mate.