I just socketed full MB .. worked pretty well so far
Praise to the +300 MA for 20 secs skill. But if you're up vs. MR classes .. yeah, consider throwing in some MA as well.
Remember, Gunner is getting nerfed big time in 4.5. I suggest you don't invest a lot of kinah in it.
You're allowed one alt in the legion if its level is above 30. Whisper me in-game and we'll sort it out.