I have an Idea. I call it the RBFLGRPG.
The Rapid Burst Fire Laser Guided Rocket Proppeled Gun.
You know how with a normal RPG you only control 1 rocket at a time? This weapon says Screw That! You can fire 3, 4, 5, or 10 rockets in one click. By default it shoots 3. Press the reload button to switch how many rockets you fire in one click. You can guess what left click does, it shoots the burst fire rockets. If you right click, than it shoots 1 rocket in one click. But no matter if your using 10 or 1 rockets in one shot, it will always be an automatic shotgun rocket launcher.

Does it sound like a good weapon idea?

@Xenoguy123 That is incredible. I will try to make this, with time of course.

TAKL aka: The Auto Killing Launcher

it is very fast automatic weapon with crossbow model but shoots SMG grenades

A different crowbar that heals you every time you hit something and its op of course

How about you get a gun that isnt for the player, but lets NPCs get revenge! It will be a weapon that you can base off the SMG and it will fire 99 bullets in 1 shot at minigun rate of fire at poor accuracy/spread each shot deals 9001 damage. I feel like its a way for combine to get payback on us. And who knows maybe it can be like a boss type weapon.

@Austin I am impressed that you would bother posting in this old of a thread, but thanks for your output! I will definately keep this idea in mind!