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AR - Police M4 (though I may change back to the G36) - I use this when running around or to soften up a armored targets.
Abilities: Shield - reactive 1.13M HP, seeker air burst 37K damage, Recovery link (not sure this is working)
OK, using the M4 to gain attention and take out 3 to 5 as they come in, then switching to shield. Preditory heal on kill is great as it seems to stack or just adds time as I kill). I have only had the shield completely depleted once trying to take Sgt Jacks - and generally he is not tankable straight up. But got him with marksman after using shield to clear buddies. And it seemed that Recovery did not work as when I died, i just died - is this not supposed to heal you just before you die?
Otherwise I have been able to easily solo all the PvE roaming bosses.
On the seeker - I use it as crowd control as the MOBs panic when on fire allowing me to take out others that are in-bound. So the change (I tested on PTS) actually works better for me. More fire damage, more panic.
On the SMG - wow 800 rpm is crazy fast. I have burned though all my ammo several times. But what fun! Also the healing is crucial, I do pop a med kit once and awhile but not as often as I was expecting.
I like the choices for HEs and the SMG setup - I put a laser on mine and love it for hipfire when I have my shield out. A change I would suggest is swap the SMG silence for a loud vent brake - it helps to draw aggro, which is what your goal is with the shield/tank build. Also, make sure your have your talents all unlocked on your other weapon (one on the M4 is grayed out). The AR is a nice choice for a primary, I run an LMG so I can do crowd control when I don't have the shield out.