(So here is my take of each Starting weapon when compared to eachother currently)...
GNASHER:~ Overall (7) has ridiculous actives and range effectiveness. Other than that the weapon would be balanced for what it is.
SOS:~ Overall (4) Slightly Under-powered, i would recommend giving it the Zeta Reload. Makes it less of a hit and run niche weapon, and more fun to use in the longrun.
Lancer:~ (6) Endless clip and Stopping power + active reload makes this weapon overall slightly overpowered.
Retro:~ (9) Not much about this weapon is currently balanced to the other weapons. Almost to the Point where you would be foolish to not use it. Some control "skill" is needed for efficiency at ranges outside of Mid, but it still shouldn't dominate all Rifles with such ease.
Hammerburst:~ (5) of our starting weapons the Hammerburst is the closest to equilibrium IMO. If other weapons were slightly Nerfed it would be perfect for what i expect it to do.