The in-game stats shows falloff like a shotgun, so [Lethal Torrent] should help a lot with range, but I'm still forma'ing and haven't tested that yet. You can save a forma by not forma'ing [Target Cracker] and skipping [Lethal Torrent], I suppose.

This kit gun is AMAZING. It acts a bit like a Zarr, which I love.

NOTE: You might not like the increased spread of Magnum Force. The in-game accuracy score only goes from 5.x to 4.x, but it's a big difference. An option to keep more accuracy while not losing too much damage is to replace Magnum Force with Heated Charge. Just shift the two 60/60's over to the left one slot and put the Heat 90 mod in the upper right slot. DPS drops to 140k (No! ikr? Lol) but it'll actually melt armor faster.

SECOND NOTE: Since making this build, I've ditched [Magnum Force] and gone with [Heated Charge] insteaed. And theeeeen ... Baro brought [Primed Heated Charge]. :) So I've updated the build with that and a Naramon forma to hold it and ... hoowee! What a monster.

Build it like this and you won't want to take a primary with you.

IMPROVEMENTS:

• Add Secondary Merciless if you've got it.
• Add Galvanized Diffusion if you've got it. HUGE increase in DPS.
• When looking for a riven, try to replace the toxin or electric mod, and also roll multishot, crit change, and crit damage. Good negatives are zoom, damage to infested, ammo maximum (irrelevant if you're using Pax Charge), or negative piercing/slash.

Want a more basic one without primed mods? Here it is:
https://overframe.gg/build/110147

This secondary is my favorite and most reliable gun. It's my Ace in the hole on Steel Path. I have a Riven for it, and, since the Sisters of Parvo update, I've made it even more powerful. Here's the build for my own current (ULTIMATE) Megaton Mushroom, highly customized to me, just for fun:
https://overframe.gg/build/179978/ (The ultimate form)