↑The Art of Fallout 4 p.21: MACHINE GUN The first gun made for the game. We mainly wanted something beefy that would look right in the power armor's hands. It was also a chance to explore the modification and customization. We designed it to allow interchangeable barrels and magazines. At this early stage of the project, we didn't plan on giving the player too many options, but we'd go on to develop a deeper and more flexible system. This particular gun would later become the assault rifle."
↑Joshua Sawyer on Tumblr: "Big Guns was never going to be part of F:NV, but the GP Machine Gun was going to be a .308 MG that I later decided was unnecessary in the base game. I think my initial idea was to base it on the M60. In the end, the LMG is an aesthetic blend of the M60 and M249 SAW. We added the .308-chambered Automatic Rifle (BAR) in Dead Money, and I think the limited mag size, high damage, and relatively low RoF set it apart from the LMG."