Le Fusil Terribles

The Le Fusil Terribles is a unique weapon in Fallout 4.

Characteristics
A unique combat shotgun bearing the Violent effect, which deals +25% damage/limb damage but also significantly increases recoil.

Weapon modifications

 * Light frame receiver
 * Long Ported and Shielded Barrel
 * Full stock
 * Drum magazine
 * Front Sight Ring
 * No muzzle

Variants

 * Justice - sold by Penny Fitzgerald in Covenant.
 * Combat shotgun - Standard variant.

Locations
This unique-named legendary weapon is found within the massive floating Raider encampment, Libertalia. It is located at the top of a lootable wooden crate within the Captain's Cabin at the top of the compound. The crate is located immediately across the room from the door, beside a burning lantern.

Behind the scenes
While the French is not perfectly translated (translating more directly to "The Terrible Gun", with "terribles" unnecessarily pluralized), the name, along with the gun's role as a unique combat shotgun with higher damage but higher recoil, all make it a likely reference to The Terrible Shotgun from Fallout 3.

The name of the weapon is likely a reference to the french novel and movie Les Enfants Terribles

Le Fusil Terribles