How 'bout a new gun for Correction Nine?
It's basically a big sniper, but the difference is that it has no piercing, is 100% hit scan and makes a small blue explosion when it hits something (however the effect should be a white-cyan shockwave coming out from the object it hit. You can compare it to the rail gun from Halo.
It should deal a tiny bit more damage than a heavy railgun, but it won't reload on your back and it takes more longer to reload. I know it sounds OP but that reason alone can't just shoot down this idea because the Ray Rifle is OP anyway.
Would be a weapon for Noir Lime in PB3 perhaps.