Custom Weapon Thread

I've been looking through all the private servers out there, and it looks like they all have custom weapons, and I read somewhere else that there's this program called Cola that can help. Anyways, I'm no expert with this stuff, so I'll either learn it later, or leave it to someone else, but I want ideas. I'll do some myself of course, but I'm a perfectionist and won't stop until I can finally say "Yeah this looks good" And then I'll probably go back to it and update it.

If you're good at drawing you can make a drawing of your weapon idea, otherwise try to describe it in great detail.