This build optimizes for damage - destroys most mobs and definitely can solo named enemies easily.
The MDR will be your go to for 90% of the time with the Devil for slightly further targets and for recovering your ultimate via coolheaded. This build will allow for an approximate 20s~ cooldown on flashbang for great utility which also buffs your damage via the competent and distracted talents. Great for mowing down a boss or for blinding groups of enemies at choke/spawn points. During these moments you should be able to kill 4-6 enemies alone within the duration of a blind as long as you are aiming for headshots.
Be warned - this is an advanced build which requires decent accuracy (headshots are important). Even though your First Aid can heal you for roughly 60% of your health, you are quite vulnerable, so position yourself well and stay mobile to proc On the Move talent. This is NOT built for solo players, but for group play; I'd recommend a skill power user for heals/pulse.
P.S. I don't know why the Devil does not allow me to choose the VX-12 scope in this build, but please use this scope instead of the one shown above.
Make sure you take advantage of spawn/choke points and especially watch for when bosses spawn to quickly eliminate them before they can do any damage.