There are no machine guns to use permanently in red dead redemption there is one mission where you use a gatling gun to storm Fort Mercer but other than that it is rifles and pistols.
Yes, machine guns are much faster than Gatling guns. Gatling guns must be hand cranked and fed bullets at the same but machine guns does not have to be hand cranked. All they needs are bullets. Machine guns also fire more bullets faster than Gatling guns.
Yes. All Gatling guns are heavy but have to be hand cranked and fed bullets at the same time. Machine guns are also heavy too but not all of them. Machine guns have to fed bullets only but machine guns also spray more bullets much faster than Gatling guns.
All of them.
All of the major players possessed machine guns by the outbreak of the war.
Not at all. You can only get it on Shotguns
All of the major players in WWI possessed machine guns before the outbreak of the war.
Assault Rifles, Sniper Rifles, Sub Machine Guns, Light Machine Guns and Riot Shields
Someone had an idea and that's how it all started.
They all did.
The Maxim, Vickers, Lewis, Springfield M1917, and Schwarzlose machine guns were all of comparable efficiency.
Who all ever was involved in the war.
All sides involved did.