I made a post earlier today, but after I edited a spelling error in the body, it was removed. So I'm posting it again.
I first got the idea when I was going through raw DPS values based on the tooltips. I noticed that Chest Beam's DPS was comparable to or better than other cylinder powers like Gigabolt and Typhoon. Chest Beam also applies it's own debuff and had the super cool Point Blank advantage that ostensibly increased the damage further. When looking to optimize damage, I noticed there was another easily applied debuff, Disintegrate. And then the build developed. Here's the backbone of the build.
Chest beam build - Freeform (Any / Multiple)
Level 6: Ego (Primary)
Level 10: Dexterity (Secondary)
Level 15: Recovery (Secondary)
Level 1: Quick Trigger (Dex: 12, Ego: 12)
Level 6: Indomintable (Ego: 8)
Level 9: Shooter (Dex: 5, Ego: 5)
Level 12: Ascetic (Con: 5, Ego: 5)
Level 15: Academics (Int: 5, Ego: 5)
Level 18: Worldly (Ego: 5, Rec: 5)
Level 21: Daredevil (Ego: 5, End: 5)
Level 1: Lightspeed Strike (Rank 2, Particle Acceleration)
Level 6: Unified Theory
Level 8: Concentration
Level 11: Lightwave Slash (Light Mend, Download)
Level 14: Conviction (Rank 2, Rank 3)
Level 17: Quantum Stabilizer (Rank 2, Rank 3)
Level 20: Chest Beam (Rank 2, Rank 3)
Level 23: Lock N Load (Two Smoking Barrels)
Adv. Points: 22/36
Ego: Insight (3/3)
Ego: Aggression (2/2)
Ego: Follow Through (3/3)
Ego: Sixth Sense (2/3)
Vindicator: Aggressive Stance (2/2)
Vindicator: Merciless (3/3)
Vindicator: Modified Gear (2/2)
Vindicator: Mass Destruction (3/3)
Guardian: Fortified Gear (3/3)
Guardian: Ruthless (2/2)
Guardian: Find the Mark (2/3)
Guardian: The Best Defense (3/3)
Mastery: Ego Mastery (1/1)
The rest of the powers can be filled with an Active Defense, heals, or other utility powers. Unfortunately, the Point Blank advantage doesn't work, but Chest Beam deals plenty of damage otherwise.
The only power decisions worth noting are the Active Offense and Passive. Lock n' Load's Two Smoking Guns advantage has synergies with the melee powers in this build, so I highly recommend it. Passive wise, either Quantum Stabilizer or Electric Form give the best damage. I went with Quantum for the all-damage resist and knock resist. Composure is also a decent choice if you want more dodge chance, even if it deals slightly less damage. I didn't look into Night Warrior or Targeting Computer, but they might be fine.
The rotation for damage is Fully charge Chest Beam, Lightspeed Strike Combo to apply Disintegrate, then Lightwave Slash to apply Download, then fully charge Chest Beam twice. Refresh Disintegrate/Download with Lightwave Slash. It's kinda annoying, since Download only lasts 10 seconds, but as long as you stay in melee range to do the Slash, it should be fine.
Gearing wise, all points should go into ego. This, combined with the equilibrium from Recovery secondary superstat, the energy from Concentration and Unified Theory, and the discount from Ego's Insight Specialization, gives enough energy to do the above combo without needing to use the energy builder. That's with R6 Ego mods and Heroic gear.
And that's it. If you have any suggestions or critiques, I absolutely appreciate it, but I'm more posting this because I found something kinda cool with a power I don't see that often.