The CK-3 was designed for automated scrap recovery — a quadruped platform that roams salvage yards and industrial waste sites, identifying valuable materials, cutting them free with its jaw-mounted plasma cutter, and carrying them back to collection points. Crucible sold thousands to industrial recycling operations. Then the Shelf got hold of them.

The CK-3's jaw-mounted plasma cutter — designed to cut through industrial scrap metal — works equally well on armor, vehicles, and people. Its chassis is built to absorb impacts from falling debris and industrial accidents, giving it the durability of a light armored vehicle. And its scrap-identification AI, designed to locate and prioritize valuable materials, was trivially reprogrammed by Shelf tech-runners to identify and prioritize human targets instead.

The Junkyard has become the most common combat automaton in the Shelf — not because anyone designed it for war, but because it was cheap, available, and easy to weaponize. Shelf gangs, resistance cells, and desperate individuals have all acquired reprogrammed CK-3 units. The units still look like industrial equipment — scarred, dented, covered in cutting marks and welding slag — which gives them a ramshackle appearance that disguises genuine lethality. A Junkyard doesn't look like a weapon. It looks like a piece of garbage that happens to be able to cut you in half.