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How about a gun blade? Automatically takes your melee and ranged slot but you look badass as hell (or maybe just really really stupid)
Expanding on that idea. An energy rifle that can switch modes and emit a lightsaber beam from the barrel.
Personally I am a customization whore so I would want an ultra-modular weapon that could go grenade launcher/wide gauge shotgun & assault rifle/designated marksman rifle
I'm unoriginal so: the Peacemaker from Jak 2.
It takes a turn to charge but it does some rad psi or electric damage.
Or just the Morph Gun in general, but I have no idea how maddening it would be to code that.
A modern 40mm grenade has an explosive radius of nearly 5meters... and is liable to kill nearly anything inside that blast radius (range and damage increases if you're using shrapnel rounds). Who knows how powerful the ones in the future will be. Though to be fair, I have no idea how you end up not killing things with lava sabers and bullets either way... On a related note, 40mm grenades have an arming distance, which is typically a minimum of 10 meters, to prevent a derpy soldier from killing himself, so you can't fire it at the typical "combat range" in game. On another related note, the grenade itself is fired at a velocity of 75m/s, so even getting hit by a dud grenade is gonna hurt real bad. I'm a military geek don't hate me ><