It’s definitely later, I think I got my hands on it in Biome 4 or 5.
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get the Rotgland Lobber in Biome 1, find the explosive rot perk and melt those robot asses in Biome 3. Rotgland lobber carried me easily through all the way to the end of the game after finding it the first time.
Edit: Hollowseeker with Serrated Projectiles is also really good, but doesn’t do the same damage. Stack Protection and Repairs throughout the biomes, Biome 2 usually has a few ones in the 4-way split rooms.
Edit 2: Another tip: Swap the controls to dash on R1 and use consumables on L1. It takes a while to get used to it but it makes it possible to move and aim while dashing. Make the deadzone on the analog sticks slightly smaller and increase aiming sensitivity a bit. Also, increase the adrenaline, overload ammo and aim reticle size bigger and less transluscent to always be able to tell when to reload.