Pre-quirk, no mastries at all, during the Pot o' Gold event. Was surprised at this result, but found that playing this build as an opportunist and support assault lets it do amazing things. You're not a face tank, but as mobile fire support that isn't going to fold the first time an enemy assault sneezes you can definitely be a threat! Since quirks are out now, I'd suggest considering mirror-imaging the build and swapping out arm-pods for quirks to resemble: Nets a stronger MPL arm, and +10% UAC velocity and cooldown with a jam-chance reduction. RT/LT are a matter of preference...getting up to 4% turn rate, +2 Yaw +4% yaw speed, or +5% accel/decel are all good enough to warrant investigating since they aren't being used for hardpoints. Build also works on the D.