I was in charge of updating the arms for M19, I focused on the anatomy and kept building for each arm.  I used several scans and photos for reference to arrive to all the shapes.

The idea was to use the new shapes to create new arm geometry for the game as well as normal maps. While the new geometry was created, the normal map implementation was not done by the time I left the project.

There were many iterations and reviews to arrive to a shape that would fit the goals for M19.