With the introduction of incarnon genesis upgrades I decided to take it upon myself to spread my [Braton] build with the world.

Evolutions

Evolution 1: You don't get a choice here, just unlock transmutation
Evolution 2: I took daring reverie but I'm not sure if its better than the multishot buff so it's your pick
Evolution 3: Out of the three choices, I'd say gunsmoke pick up is the best choice
Evolution 4: For the fourth evolution take prelude of might. The 36% critical chance provides enough crit chance to get the most out of the buff without going overboard.

Building for factions

The listed build is built to fight grineer but that still leaves the other two major factions

For corpus, replace [Stormbringer] with [Infected Clip] and [Cryo Rounds] for [Hammer Shot]

For infested, replace [Cryo Rounds] with [Stormbringer]