We have enough generic weapons that fit those standards. In other words...
Name a weapon that's like the list below
1. the Chaingun had a secondary fire that shot a rocket, reloaded, and shoot another off
2. Helghast machine gun had a shotgun secondary fire
3. the helghast rocket launcher had a three burst rocket throw (like a tri-shot grenade launcher)
4. the helghast gun was a burst pistol (fired 3 shots per fire) and had a secondary single shot.
and Post a link of the Download so I can know it's actually working.