Use all the Gunners throwables at once!
The hurricanes cluster charge converts each missle into a tiny cluster grenade.They do less damage than the nade, but you have 128 of them!
The napalm infused mod effectivly replaces the incendiary nade. though the missles fire dont linger, a single volley detonated over a horde of bugs can light them aflame almost more efficiantly then the incedairy.
The BRT is was pretty much just a hand held lead burster to begin with and this mod+overclock set up just makes it even closer.
Finally, equip sticky nade as your sticky nade.
Have fun!