The signature weapon for the [Diriga] will also be your best companion weapon when you go to the open world areas.
Few things to know: this weapon is slow. VERY slow. So any form of increasing fire rate is welcome. [Vile Acceleration] and [Speed Trigger] are awesome, and if you get a riven with fire rate, even better.
The [Vulklok] is a sniper rifle with a very high CC but also a decent status chance. Let's exploit it.
My build is for electric+viral, but depending on the open world you're dealing with, you can go with corrossive+fire instead.
This is a sentinel weapon, so keep in mind it won't fare very well in steel path. However, for the regular open worlds, it will do perfectly nice and will let you keep fishing or mining without having to worry about roaming enemies.