How would one about verifying that parts from one gun would fit and function on another of the same make and model? What about aftermarket parts sold as replacement parts for hard-to-get original ...

In just a few decades, the U.S. Army would see itself go from a single-shot, blackpowder design in the form of the Trapdoor Springfield to a modern, semi-automatic fighting rifle in the M1 Garand.

Use these scavenged resources to craft ammo in Marathon so that you never have to run with an empty magazine again.