i don't see a spec with stabalizers...
personally, i'll take that over 3% crit. i use PS, UL, and CM quite often in PvP.
^ This. Frankly on my server running a pyro merc without stabilizers will get you destroyed, 9/10 enemy dps are pyro pts and marauders, with a good understanding of our weaknesses. I have actually been laughed at before for trying builds without stabilizers, as soon as someone sees their attacks pushing back your casts expect them to mark you up and **** on you for the whole game.
Yes - you can play pyro without stabilizers but what happens when you can't proc a railshot from an unload? (i am so unlucky that this seems to be ~60% of the time) You are sometimes forced to use power shot, and in those situations you will be glad you picked up stabilizers. Pyro is all about being able to reliably burst down people, and if you get pushback-ed while proccing your second railshot in your rotation, good luck.