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Here's the British Vickers-Maxim version, obviously chambered for the .303 British cartridge. The British kept these in service all the way up until the 1960s, because they remained useful enough for area denial, but lighter mortars could fill this role better.
Taking them out of service, they decided to do a final endurance test with one gun, checking it over with mics an gauges, then proceeded to put an enormous supply of ammunition through, something like 3.5 Million .303 cartridges, over more than a week, just rattling away non-stop, people carrying ammo, shoveling away spent casings with snow shovels, supplying more water and barrels. After the end of this endurance test, mics and gauges showed no changes or wear at all anywhere in the gun.
These guns still get around out there in the world on occasion, being a functioning machinegun, they get used in guerilla warfare and insurgencies because they're captured from old armories, and hey, if there's ammo and belts, may as well use one of these for a defensive position, while more modern and lightweight guns get used for more mobile roles.