For maximum damage to basically anything

Since you can’t aim with Arqubex, [Critical Focus] and [Marked Target] are completely useless.

The new arch gun mod increases theroretical dps slightly but makes the gun do almost pure radiation only, obviously not needed but great against Necramechs/Eidolons and the new murmur enemies

People say that [Sabot Rounds] is a better mod to put on, but putting any element damage mod gives more damage, so basically having 1 combined elemental damage and 1 normal elemental damage gives higher damage if you’re not building for pure radiation.

I built radiation just for enemy Necramechs and the Murmur units as well as for Eidolons but you can change the elements as you wish for other enemies. (Although it probably wont matter since [Arquebex] does an insane amount of damage already)

If you want to take this to endurance runs (why?) I recommend this build instead: https://overframe.gg/build/656305/arquebex/endurance-arquebex-viral-heat-dps/