In a factory.
I think you mean bullets, not builts- and that varies from one machinegun to another. Some hold as few as 10, some use a belt of cartridges that could be any length.
I found this. "PRIZE MACHINE GUN and PRIZE MACHINE GUN CO. were made by Simonis, Janssen & Dumoulin who was located in Leige,Belgium from 1873 to 1914." "The name MACHINE GUN has nothing to do with a rapid fire repeating gun. It means the gun was made on machinery as opposed to being hand made and fitted."
steel
Yes
The first true machine gun was invented by Hiram Maxim in the United Kingdom.
The first was the gatling gun invented in 1862
Spelled Uzi, it is a submachine gun made in Israel.
The stick magazine fed hand cranked gatling gun was probably the first machine gun produced.These were in use around 1875-1880.
Potato Digger
No, it was not.
Maxim
to build up the army in wwi