A gun that has an adjustable stock for long and close range, bullet piercing rounds, silener, EOTech sight, M203 underbarrel grenade launcher, and a high capcity mag
well, since we have obviously gotten into the realm of the impossible, I would say a gun that shoots nuclear bombs that teleport to right beside teh enemy before they explode. It also shoots laser beams that automatically lock on to any enemy nearby and completely incinerate them. It never runs out of ammo either. See how easy that was? there is no way to stop it.... Also, to every singel person that mentioned a sword or a bow:
An FN p-90. 50 bullets, and it will be more than accurate enough at the distance that you will have to be in order to even hit me with your weapons...
Now, as for a somewhat realistic perfect weapon? Maybe a gauss rifle that shoots metal spikes? perhaps one that shot numerous small spikes, so that the recoil would not be overwhelming, but it could still do enough damage to take someone down?
well, the "erfect weapon" is going to need to have long range capabillity, while still being useful up close. I would say maybe a type of battle rifle? They can shoot pretty accurately and far, and they can still be used in close quarters. Hmm.... How about this:
An organism, that, when exposed to air rapidly reproduces, infecting any living thing that does not have the antidote and killing it within minutes. It will replicate fast enough to infect the entire planet in 38 minutes. there, a perfect weapon for you. 100% lethality, no warning signs, no time to react and no hope of survival.
A light speed razor flaming boomerang. You can fling it across the earth and it'll fly back to you in a matter of seconds. Also, it's armored with razor sharp spikes that are on fire. Ah, rapid speed and high amounts of direct and damage over time (from the fire)
