So... I had trouble with this at level 25 with my assualt because assualt play all 3 weapons well (in my opinion).
The T40 and the T7 are full auto and have a larger clip than the Striker. Yet the DPS for them in less.
I REFUSE TO SHOW MY MATH!
The T40 is heavy, and the T7 is light.
The Striker is in the middle. It is semi-auto, yet there's some killing power.
Solution?
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USE A SUBLIGHT!