I'd like a BFG, which stands for Big loving Gun. It would work like the Quake II/Doom 3 BFG, but may require engine changes or not.
You'd click the fire button, and it warms up for about 1 second. After this second, the gun fires a slow moving green orb of plasma that (engine change or not part) shoot lasers at nearby enemies. When the orb hits a solid object, it explodes with a huge explosion (how descriptive). It would look like the Doom 3 BFG (because Quake II's is too blue). It also shouldn't let the player switch out until it cools down.
Also, no brick damage.
