I say weapon because it gets to complicated with all the super powers you can get. Turning invisible, walking through walls, teleporting. So for this I want to limit it to sci fi weapons that at least attempt to have a tech basis. So like not the masters device that turns people into dolls. However we don’t care if we can completely explain how it might be done now. Like lightsabers are fair game. As for me I would go with the star gate zat guns as initially put in. Both lethal and nonlethas and very portable. I want to put an honorable mention for tthe minority report sonic shotgun that seems to run on wind up energy so you should never theoretically run out of ammo. although not so sure as there was no indication you could power up more than one shot at a time.
EDITED: Its a little late at this point as the answers have went way off the rails but in case it gets more replies my intention was a weapon someone might carry around and could use as one person. not a weapons system or vehicle. Also no robots or things that essentially are their own entities. It should be a weapon used in a weapon like manner. aim and fire. also that quote about sufficiently advance technology looks like magic. if it looks like magic to us instead of technology then its to far afield. I hope this makes it more clear what I was looking for. Honestly I would have like to not use weapons as a basis but there are just to many things when you look at all of sci fi.
A Gun That Can Kill The Past
Sonic Screwdriver is pretty much a magic wand with lights, so I choose that.

Yeah, I’d shoot two portals in a vertical line
Undo my belt, lean in and
Change pants without having to look down
Also I’d suck my own diiiiiiiiiiiiiiiiiiiiick
Be your own reach around
The ZF-1.
it’s light. Handle’s adjustable for easy carrying, good for righties and lefties. Breaks down into four parts, undetectable by x-ray, ideal for quick, discreet interventions. A word on firepower. Titanium recharger, three thousand round clip with bursts of three to three hundred, and with the Replay button, another Zorg invention, it’s even easier.
Plus a tempting red button
The Farsight XR-20 from Perfect Dark that can see and shoot through walls.
For no particular reason.
One that immediately eliminates all billionaires and blocks their existence forever.
While a ship, the Lexx was primarily designed as a weapon that could destroy planets, so I’ll go for The Lexx.
Phasers on stun!
Not even sci fi - I always wished that when I had each baby I was issued 5 tranquilizer darts. Not more than 5. With each, there were about 5 times I wished I could just blow a dart at them and have them immediately asleep.
Sci fi I just want a de-escalation gun.
I’d like a Death Star, you can certainly trust me with a Death Star.
Reason from the book Snowcrash. It’s essentially some highly advanced smart minigun that fits in a suit case. Mostly so I can say something like “I’ll make them listen to Reason” before I use it.
Wasn’t that The Diamond Age?
Edit: Nope, I just can’t remember for shit anymore.
It was a rotating barrel railgun, right? Water cooled?
24th century Type II phaser, specifically the ones introduced around 2373. Very multi-purpose, moreso than the zat from Stargate. ;)
But I i just want to go ridiculous firepower and over the top cool factor, any number of weapons from Ratchet’n’Clank would do.
Portal gun or gravity gun from Halflife
Phys gun from Gmod
If you get a portal gun, you get the gravity gun included
Deathwand from Hyperion. Very useful…
A MAD-3R Marauder. The single best all around Battle mech ever put together.
Have loved the Marauder since MW on my Tandy. Dual ppcs and a long range autocannon? evaporate some jenners and locusts before they can even react to your presence







