Thumper Shotgun

Thumper Shotgun is an Overworld Ranged in Abiotic Factor. It deals 18 damage of the Acid type. It is a Tier 5 item. It weighs 7 per unit. In-game it is described as: "A hefty shotgun that launches acidic, ricocheting rounds, with biometric locks removed."

A conventional firearm. Keep it fed with the matching ammo type and use range to soften a target before it closes the gap.

Its 18 damage places it on the lower end of the 21 Overworld Ranged entries tracked here (#19 by raw damage).

Against the enemies catalogued here, 14 are weak to Acid damage — including Armored Exor, Jotun, Jotun of the Fallow, and 11 more — so this is worth carrying before those fights.

Practical notes: it has 35 durability before repair.

Verdict: Overall Thumper Shotgun is "a low-damage Overworld Ranged" pick whose Acid damage profile should be matched to enemy weaknesses.