Got another armament post for y'all, let me know if you have questions:
Name: Winchester Model 1910 Heavy Machine Gun
Designer: Winchester Armament Company
Type: Short-recoil operated machine gun
Caliber: .50 Multipurpose [1]
Feed System: Disintegrating belt (single or double feed)
Adopted: 1911
Notes: Developed as a result of War Secretary Roosevelt’s attendance of the 1904 Napoleonic Centennial in Paris, the U.S. military sought a weapon to counter France’s formidable armored-car and dirigible forces [2], with a focus on utility against multiple kinds of targets and being more mobile than even a light field gun, as dictated by contemporary technology. Built by the same design team that created the M1902 General Machine Gun, the M1910 was similar mechanically to its predecessor but built up in scale to handle the massive .50 anti-material cartridge in its various full metal jacket, armor piercing, incendiary and high explosive variations. Due to this round’s incredible mass, it had the added benefit of extending the engagement range of dedicated machine-gun emplacements beyond almost any contemporary design, allowing a single position to theoretically defend against any given manner of threat conceivable [3].
Not only was this machine gun decisive in use by U.S. military forces in the Great War, it was licensed out to other leading L.A.R. members such as Mexico, Colombia, Chile, and Nicaragua. Further development on the design in the 1950s led to the current E1 model, which has a simple-change barrel, accommodates a variety of .50-derived cartridges, and has improved ergonomic features like a variable-tension butterfly trigger and a lighter receiver. The fact that it continues to serve in over 80 national militaries, and has only been matched by the British Commonwealth’s L86A1 in the heavy machine gun arena [4], is a testament to its capability and simplicity. It has even experienced a growth in popularity as a sniper round due to its power and long-range ballistic stability (in particular, the U.S.A./L.A.R.’s M1980 High Power Sniper Rifle [5]).
[1] The different moniker from OTL reflects a lack of direct Browning influence beyond the initial gun design. And bear in mind, the M1902 machine gun is developed and fielded early ITTL, which has knock-on effects on TTL's Ma Deuce development/adoption.
[2] With advancements in small arms and vehicular technology ITTL, and the specter of Napoleonic military ambition in Paris, I figure there’d be an earlier push for a heavy, armor-defeating cartridge in development.
[3] Or at the very least, provide a sustained fire capability to the U.S. Army equal to or greater than other armies using water-cooled designs. And once the move to a more lightweight machine gun like the “Puke” happens, you still have a long-term base of fire weapon at the sub-munition level.
[4] Not to speak for anybody doing a Eurasian weapons post, but to date there’s been no mention of a DShK equivalent so I’m assuming there is none ITTL (perhaps something in the 20-30mm range fills that void in Russia?).
[5] OTL McMillan TAC-50.