Quicklaunch is an inactive US company attempting to use a type of space gun to launch payloads into low Earth orbit.
Its horizontal and vertical direction (azimuth and elevation) could be adjusted based on customer launch requirements.
The designed payloads could include spacecraft, satellites, consumable, water or fuel to supply a propellant depot in orbit.
[1][2] In a 2016 article, Hunter remarked that the work had been put in stasis due in part to Elon Musk's company, SpaceX, taking up the challenge of reducing costs to orbit.
[4] Later, Hunter ran a new start-up called Green Launch that is also developing a space light-gas gun.