Venom Snake's bionic arm

A bionic myoelectric arm prosthesis was utilized by mercenary commander Big Boss in 1984. The prosthesis replaced his left arm, as it had been lost in the aftermath of the XOF Trojan Horse operation in 1975, although he was originally fitted with a simpler prosthesis. The newer arm was fitted shortly after his escape from the hospital in which he had spent nine years in a coma.

Specifically designed for Big Boss, the arm was red in color, although it could be customized to include new gadgets and colors, including an upgradable battery that could deliver 120 volts to knock an enemy unconscious and a missile-based function where the arm will be launched from the stump and proceed to be guided towards an enemy to take them out from afar. The latter function can also use its explosive fumes to knock an enemy out cold if the arm remained attached, and was equipped with a miniature camera.

Behind the scenes
Big Boss's prosthetic limb will make its debut in Metal Gear Solid V: The Phantom Pain. It resembles a similar prosthetic hand used by Vladimir Zadornov in Metal Gear Solid: Peace Walker.

The first revealed variant of Big Boss' arm is called the Stun Arm, debuting in TGS 2014.

"STUN ARM A myoelectric arm prosthetic designed specifically for Snake. Capable of delivering a high-voltage 120V electric shock to incapacitate targets. Upgradable battery"

- Stun Arm menu description in Metal Gear Solid V: The Phantom Pain TGS Demo

In a gameplay demo released on July 7, 2015, another variant called the Blast Arm was revealed with the ability to "rocket punch" Snake's hand similar to Zadornov at the end of Peace Walker. The hand can be controlled remotely and explodes on impact.

"BLAST ARM Snake Custom remote control prosthesis. The miniature camera-equipped hand can be released to run free and harm distant enemies. Once released, the hand is guided using [the Left analog stick], accelerating with R2 and decelerating with L2."

- Blast Arm menu description in Metal Gear Solid V: The Phantom Pain Freedom of Infiltration Demo

On July 31, Kojima unveiled a new image on his Twitter account regarding a new arm. It was colored blue and had the text "WISP" on it. The name "WISP" was a reference to Zone of the Enders, where it was a weapon to grab things from a distance.

The Western release version of the "Collector's Edition" and the Japanese "Premium Package" will feature as physical inclusions to the set a half-scale version of Big Boss's arm and a full-scale version, respectively.