[quote=Jinxlynx]
Also there could be alien weapons like one I made up called a Shard Gun that works just like the Railgun but uses shards of a crystal that is broken up in the weapon and fired out either one at a time or in a massive blast with the shotgun form.
[/quote]

Now you just need the shards to explode a few seconds after impact. Sounds like I've heard about that somewhere.

[quote=Metronome]
So as far as futuristic weapons go, what do we got?Like lasers and shit or...i never understood how laser guns worked tbhlike it just seems like bullets would be more effective, you know?maybe some kind of high tech laser bulletsyeahlaser bullets
[/quote]

Well, my characters have a rail gun (works by vaporizing or just heating the back half of the "needle" by letting it short thousands of volts of electricity through it, which pushes it forward. The Gauss gun uses electromagnets to accelerate metals.) and a laser bow, which just has a more advanced version of an industrial laser on the handle.

The reason you don't use normal guns is because:
1) the ammo's bulky and heavy. This severely limits the number of rounds you can carry.
2) They require oxygen to fire, so useless in space or non-oxygen atmospheres
3) They work by building up pressure in a casing behind the bullet, which propels it. There's only so much pressure you can put into something before it starts to crack, so expensive alloys would be required to make the firing chamber strong enough to let you use, say, C-4 to fire a round. 
4) By this point chemical explosives store less energy per cm^3 than batteries, so it's an inferior way to fire a weapon.

If you really want a classic gun style, you could use a plasma explosion to propel it. That would lower ammo size and weight, and let you use standard batteries as a power source.

Everyone: I added a little self defense training to Chris, but it makes sense as the crime rate is probably outrageous on Earth.