Titans:

Carnifex class fusion rifles: Unlike the archtypical fusion rifle which uses a slow charge to maintain battery life and lower operator risk, the Carnifex class keeps the capacitors hot with a trickle charge, so one shot is ready to go on demand. The downside is that the trickle charge takes longer between shots, making a miss much more dangerous. Also, rumors of hits on charged rifles causing a small explosion still persist despite the Forge's statement to the contrary.

Hubba Hubba. This would be an awesome fusion rifle setup that I've never thought of. It's precharged for an instant shot, but has an icebreaker style recharge ability. Kuddo's to you.

Warlocks:

Charged Particle Cannons: feeding of the antimatter generated by a warlock's on-board supercollider, these heavy weapons release the same explosive power as a rocket in one, pinpoint beam.

Spartan Lazer? :)

Hunters:

Duelist's sidearm: Precision weapons with a low clip size and slow rate of fire, but capable of precise aim and elegant, pinpoint fire.

Don't HC's to this already? lol

Titan: REAMS - Range Extending Affecter for Melee Situations -

The REAMS is a somewhat rifle shaped rectangular housing constructed primarily of Light channeling field plate. By charging the REAMS with a burst of Light, a Titan is able to apply the weapon directly to the forehead (or other body part) of an enemy who would otherwise be slightly out of reach. The specially constructed field plate panels direct the Titan's light into the nearby enemy to devastating effect. When a charge of Light is not available, the hardened field plate construction of the REAMS automatically reverts to a failsafe mode that delivers a strong kinetic impact to the target. The REAMS also includes an integrated 8x zooming dynamically stabilized combination imager / laser designator.

:)