Love it! If you get the talents unlocked(which I do) ..... You get a 5.50 % cool down on all skills with head shots, 3% heal on critical and clean status on kills. Since I have got that gun I seem to always have a skill to use, not to mention.... I can use my signature about 3 to 4 times per hard run! With my dps at close to a 100k....it melts elites. Definitely try to get it!

Koolbeenz that's probably the trick

In the closed beta atleast, it was an absolute monster, tore through most enemies. Not sure about full game.

Blue-print is sold for a Military AK-74 in the gear vendor at your base. A blue-print for a slow ROF (SA-58 or something) is sold by the very top DZ vendor (need DZ 50).