Stamping parts was a process, here called cold extrusion, in which piable metal was formed without heat into a finished shape. It was similar to forging.
Springfield Armory NHS, US NPS
By the mid-20th Century, cold forming pliable steel had been perfected and required the use of powerful machines like these.
Springfield Armory NHS, US NPS
Springfield Armory manufactured many of the cartridge 'clips' for the M1 'Garand' Rifle during WWII.