The GK-5 sentry droid was a squat, multi-legged droid in operation during the Galactic Civil War. It was similar in appearance to the DSD1 dwarf spider droids and LM-432 crab droids that comprised part of the Separatist Droid Army during the Clone Wars. One GK-5 sentry droid was stationed on Mustafar during the Civil War, where it was recruited by HK-47 as part of his growing droid army.