Round 2! Below are swtor credit the changes planned for Arsenal Merc / Gunnery Commando in Game Update 5.3. Here are the notes from the Combat Team:

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Note: All changes below are currently in development and are subject to change before being released.

Mercenary
Arsenal

Blazing Bolts deals 4.89% less damage and costs 20 heat (up from 16)
Barrage no longer increases the damage dealt by Blazing Bolts, but still finishes its active cooldown
Riddle no longer improves Unload
The critical damage bonus provided by Target Tracking is now 15% (down from 30%)
Decoy now has 2 charges (down from 5)

Commando
Gunnery

Boltstorm deals 4.89% less damage and costs 20 energy cells (up from 16)
Curtain of Fire no longer increases the damage dealt by Boltstorm, but still finishes its active cooldown
Rotary Cannon no longer improves Full Auto
The critical damage bonus provided by Deadly Cannon is now 15% (down from 30%)
Decoy now has 2 charges (down from 5)

DevNotes: With the changes to Arsenal / Gunnery, we wanted to bring the Discipline down to its target DPS. We also wanted to make heat / energy cell management a little more challenging for the Arsenal / Gunnery player, so we slightly increased the cost of Blazing Bolts / Boltstorm while reducing the damage it deals.

Another goal we had for Arsenal / Gunnery was to tone down its burst damage potential a bit, so we reduced the critical damage bonus granted by Target Tracking / Deadly Cannon to shrink the size of those big Heatseeker Missile / Demolition Round and Rail Shot / High Impact Bolt critical hits.

Finally, we felt that Decoy needed a significant reduction in power, so we reduced the number of charges it provides from 5 down to 2.
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