The GK-5 sentry droid, active throughout the Galactic Civil War, was a short, many-legged droid. Its design resembled that of the DSD1 dwarf spider droids and LM-432 crab droids used by the Separatist Droid Army during the Clone Wars.
A GK-5 sentry droid found itself positioned on Mustafar during the Galactic Civil War; there, HK-47 enlisted it into his expanding droid forces.
The GK-5 was a compact design; later versions included the GK-6, GK-17, GK-18, GK Oppressor and the Doom Bringer.