Heavy Combat M1913-A

The Heavy Combat M1913-A, more commonly known as the "Crocodile" is a combat-based prosthetic arm specialized for use in cold-climate areas. The Crocodile has no digits, and is instead a large chainsaw with a jaw clamp. Like all cold-climate automail, the M1913-A is made of carbon fibre rather than combat steel, which helps prevent frostbite. The exhaust system from the chainsaw also helps to prevent frostbite on the wearer's connecting nerves. This allows the wearer to go on longer missions in the cold that would not be possible even with other types of cold-climate automail.

Trivia

 * Buccaneer is the only character seen who wears the Crocodile model; though it's apparently well known among those who work with automail, due to Winry's excitement over seeing one.
 * The Crocodile's exhaust system allows the wearer to spend more time in cold-climate areas than if they were wearing the Mad Bear G or any other carbon-fibre model. This fact is left out of the anime, presumably for time.
 * The Achilles heel of the M1913-A is that is has no digits, and can therefore not function as a hand. This makes it unsuitable for casual situations, and leaving its wearer in a vulnerable position if it is damaged in such a way that is ceases to function.