Sine_Fine_BelliThe M2 Browning is still in use in space.
empireOfLove2Gunpowder is self oxidizing. As long as they used a non-evaporating lubricant on the actual mechanical components like graphite, and included a barrel liquid cooling loop, the M2 would operate totally fine in space.
What about barrel cooling? Getting rid of heat is a major challenge in a vacuum.
That’s why I say you need to provide a closed liquid coolant loop around the barrel that would ve integrated with your ship’s heat management system, to replace the air cooling of the barrel.
talen.wikipedia.org/wiki/M2_Browning
The development of the M1921 water-cooled machine gun which led to the M2, meant that the initial M2s were, in fact, water-cooled. These weapons were designated Browning Machine Gun, Cal. .50, M2, Water-Cooled, Flexible.
space ready since 1933! We really were ahead of our time!