Don't let the numbers fool you: this does an absurd amount of damage. Primary [Frostbite] is slept on. The [Lenz]'s guaranteed Cold procs makes getting max stacks very quick.

Primary [Frostbite] allows us to [Reach] a 9.5x Critical Multiplier AND 4.2 Multishot when combined with Galvanized Chamber!

This means you will have 4 or 5 arrows firing per shot - and [Primed Firestorm] increases the AOE radius of every arrow that is fired, hitting even more enemies.

[Primed Firestorm] is interesting, as 44% doesn't seem like alot; However, an increase of 44% in blast radius adds up to a (100% + 44%) ^ 2 - 100% = 107.36% increase in the total blast area and a (100% + 44%) ^ 3 - 100% = 198.5984% increase in total blast volume.

TL;DR: Blast Area is Doubles and Blast Volume is Tripled.

Alternatively, you can slot in Viral and Hunter Munitions if you'd like to abuse the Slash Procs. But - Keep Primary [Frostbite]! A primer with Cold damage actually triggers the Arcane.

Stacking Primary [Frostbite] does not require the Cold proc to come from the primary: it can come from Warframe abilities such as Frost's ability kit, or any weapon that can proc Cold - even if the primary is holstered.

Unlike other weapon arcanes, Primary [Frostbite] stacks expire all at once after 12 seconds of no procs, rather than only 1 stack every 10 seconds.