Octo is obtained from the missions Slap Happy in Borderlands 2 and Lab 19 in Borderlands: The Pre-Sequel.
Special Weapon Effects
Octo means 9. – Fires 10 pellets in a 3x3 grid pattern with the centre left point missing, and with 2 of the points in the pattern receiving 2 pellets each. Pellets are slow moving and fly in a sine-wave pattern while leaving yellow orange trails.
Usage & Description
Unlike other shotguns, it remains effective at long range due to the unique projectile flight pattern. At close range however, it's outclassed by other shotguns because of its average stats. Rather than losing focus with increased range, it alternates between focused and unfocused instead. It is difficult to judge perfectly though, the optimal distances of the ranges where the shots are at their tightest.