Assault on HYDRA Headquarters
Captain America, Bucky Barnes and Gabe Jones used the Zip-line Gun to assault the Schnellzug EB912 and capture Arnim Zola. This assault led the Strategic Scientific Reserve to take Zola into custody.
After Captain America distracted the Red Skull by infiltrating HYDRA headquarters in the Alps, members of the Howling Commandos used Zip-line Guns to zip-line into the base from the adjacent mountain, storming the base through its window.
Antoine Triplett retrieved his grandfather's Howling Commando gear and offered it to Phil Coulson as a tactical advantage during the undercover investigation on Cybertek and the missions to come. The Zip-line Gun was among these items.
Triplett later used his grandfather's Zip-line Gun to create an escape route for Phil Coulson and Melinda May when they performed an undercover infiltration mission within Cybertek Corporate Headquarters.
Similar to a modern spear-gun, a Zip-line Gun is a gun-like device that launches a spear-like metal bar with an attached zip-line to set up a zip-line path for transportation. The gun is designed to launch its spear with enough force to embed it in a surface at a variable distance and properly anchor its end of the zip-line. After firing, the zip-line unravels from a spool below the barrel of the gun. The spear and gun ends of the zip-line can then be properly anchored to allow transportation from a higher area to a lower base level or across a large open space.