ALTERNATIVES:
Switch Internal Bleeding for [Spring-Loaded Broadhead] (not planning to use IB)
Switch [Galvanized Aptitude] for (Amalgam) [Serration] (not planning to use primer). Use Arcane Acceleration for faster fire rate
Switch [Galvanized Chamber] for [Split Flights] and Sharpshot for Deadhead as the previous build!

UPDATE 35: Switched from Deadhead to Sharpshot as it is another final multiplier compared to deadhead, Riven values similar to [Serration] so it is a serviceable replacement. If you do not have riven, just put serration instead but it will not be a gas build, obviously.

If you don't have riven, use the 2 60/60 mods for gas, but this does lock you out of an additional slot for broadhead/IB.

Ensnare is highly recommended. Could also use magus anomaly then condemn, or petrify (+50% on damage type modifier) + magus anomaly, these are the helminth abilities that are easiest to headshot with.