Automatic Bore Cleaner (ABC) by the South Korean company SDI Ltd (Soosung Defense Industries Ltd). The development of the automatic barrel cleaning system began in 1998, and it took 20 years of development to achieve a fully functional, proven and failure-free system. The ABC system is supports by one operator, which saves the work of several soldiers, performs barrel cleaning more thoroughly, faster, without accidental damage to the barrel and can be performed even in combat conditions.

https://www.youtube.com/watch?v=rvhwMBYWny0

Republic AP-100. 1960s concept for a 6-turbojet VTOL nuclear-capable strike fighter