.4B.03. Shotgun

Mass Effect shotgun guide: M-23 Katana, M-27 Scimitar, and M-300 Claymore Shotgun details, including where to obtain them.

M-23 Katana Shotgun

This shotgun is very effective against shields and biotic barriers, but weak against armor.

Obtain: Default, Freedom's Progress.

M-27 Scimitar Assault Heavy Shotgun

This shotgun is very effective against shields and biotic barriers, but weak against armor.

Obtain: Illium, Recruit the Justicar.

M-300 Claymore Heavy Shotgun

This is a rare Krogan shotgun. It is effective against shields, armor, and biotic barriers.

Obtain: This shotgun is a researchable prototype upgrade usable by Grunt. It can also be used by Soldier or Vanguard classes if chosen as Advanced Weapons Training.