I've seen so many bad Trumna builds on this site, I decided to create my own. Do not use any Galvanized mods except Chamber - [Trumna] deals primarily AOE damage, so receives next to no benefit from Aptitude. Similarly AOE does not trigger headshots, making [Galvanized Scope] hard to trigger and maintain.

[Vile Acceleration] can be swapped for [Primed Shred]. Contrary to popular belief, [Trumna] can make use of punch through as it does not effect the alternate fire (or the explosion from primary).

[Hunter Munitions] can be swapped for faction mods, but I personally could not be bothered dealing with them.

[Infected Clip] can be swapped out for [Malignant Force] if you prefer higher status, but I find it procs often enough as is and prefer the extra damage.

Stabilizer is a must for your exilus slot - [Trumna] has a LOT of recoil, and increasing its fire rate makes it difficult to use without recoil reduction.

This build will tear through enemies, steel path or not. Save alt fire for big targets and watch that health bar disappear in a single shot.