Flayer is an legendary shotgun in Borderlands: The Pre-Sequel added in Claptastic Voyage DLC. It is manufactured by Jakobs.
It has an increased chance to drop from viruses.

Special Weapon Effects

OMG, what's it doing to Sanchez?! – Consumes 2 ammo per shot, heavily increased magazine size (In comparison to other Jakobs shotguns), increased weapon damage, slightly increased accuracy. Fires 15 bullets in a tight spread (17 with Rustler's prefix).

Usage & Description

The Flayer is a significant improvement over a standard Coach Gun, as its upsides negate the usual downsides of normal Jakobs shotguns (low magazine size and accuracy). Coupled with its increased damage, the Flayer can easily kill tough enemies or multiple weaker foes in a single magazine.

It should be noted that while the Flayer's damage per second is unrivaled in regards to other Jakobs shotguns, the high number of shots also means severe recoil if shots are spammed.