Sentries are humanoid-esque robots lacking arms. The plating of their body is green, with their knee joints and feet being a metallic grey. Their upper body consists solely of the barrel of a sniper rifle, with an antenna protruding from the back of it. To the right of the barrel is a small camera with pink lens, most likely the Sentry's eye. A small ammo box is attached to the back of Sentry's hip. Source: The Wiki.
The Sentry from Ultrakill
