The Striker

The Striker is a unique weapon in the Fallout 4 add-on Far Harbor.

Characteristics
A large projectile launcher, able to fire modified bowling balls by default and mini nukes once modified.

When hitting an NPC, a "strike" sound effect may play, similar to how the railway rifle plays a train "choo choo" when reloading.

Reading through the terminal entry "That was Close!" on the nearby terminal will give you access to make modified bowling balls at any chemistry station with the proper materials.

Location
This weapon can be obtained from Beaver Creek Lanes, in an upstairs office that can be found by taking the stairs up in the employees only hallway.