Harpoon gun (Far Harbor)

The harpoon gun is a weapon in the Fallout 4 add-on Far Harbor.

Characteristics
Originally deployed as a ship-mounted weapon meant for hunting large marine animals, the harpoon gun has been converted into a man-portable heavy weapon. Its harpoons are capable of inflicting very high damage (more than a Broadsider cannonball without maxed-out Demolition Expert), but it can only hold one harpoon at a time and takes a long time to reload. Similarly to the railway rifle, projectiles fired by this weapon can pin enemy limbs to walls, as well as deal high limb damage.

Aside from the option of adding a sight or a low-powered scope, the harpoon gun can be modified to change its function on the battlefield. The flechette mod turns the weapon into a heavy shotgun of sorts by replacing its single large harpoon with seven smaller ones that get fired with surprisingly tight spread, thus making them effective at ranges where normal shotguns would not hit anything anymore. Flechette harpoons can inflict multiple critical hits per shot but severely reduce the weapon's effective range, and they still require a lengthy reload after every pull of the trigger. The barbed modification, on the other hand, is more straightforward and simply adds a bleeding effect to the single projectile fired.

The gun's standard and barbed harpoons can be recovered from targets and obstacles hit with them. Flechettes can only be recovered from dead enemies in the form of basic harpoons but may yield more projectiles than were originally fired.

Variants

 * Admiral's Friend - Unique variant with the Instigating Legendary effect. It is sold by Allen Lee in Far Harbor.
 * Defender's Harpoon Gun - Unique variant with the Penetrating Legendary effect. It can be obtained as a quest reward for completing Hull Breach 3.
 * Skipper's Last Stand - Unique variant with the Resilient legendary effect. It can be obtained as a quest reward for completing Shipbreaker.

Locations

 * Occasionally carried by Trappers.
 * Can be bought from weapons vendors on the Island, primarily Allen Lee in Far Harbor.

Behind the scenes
This weapon was to be released in the original game and was most likely tied with the quest 20 Leagues Under the Sea, but was cut. The model found hidden within the files of the original game and the completed weapon which appear in Far Harbor are dramatically different in appearance.

Bugs
Commonwealth mirelurks may sometimes fly off in random directions at high speeds after a successful hit with the harpoon gun, which may persist into the corpse if it is killed and render looting said corpse impossible.