I made a similar suggestion a while back - basically, instead of it being a "Firearms Pool", instead make it a "small arms" or some sort of general security/self defense/survival pool. Something like:
1. Pistol shot - basic ranged lethal attack dealing minor damage with a fast recharge, possibly with a defense debuff that many gun attacks have.
2. Set snare - a simple power placed down where you are currently standing, which slow enemies that pass over/near it, possibly dealing some minor DoT, (toxic/lethal).
3. Poultice - A simple self HoT ability, (possibly with a minor amount of toxic resistance).
4. Camouflage - Somewhat like the old stealth power - provides a higher degree of stealth than most powers, but imparts a hefty movement penalty.
5. Lay of the land - Provides a minor tohit, recovery, and movement speed buff to you and your teammates while toggled on.