Flare gun

The flare gun is a weapon in the Fallout: New Vegas add-on Lonesome Road, Fallout 4, Fallout 76 and was planned for inclusion in Van Buren.

Flare gun
The short-barreled, breech-loading signal pistol can also be used as a weapon. It launches its projectile in an arc, and can also be used for long-range indirect fire.