A 50 caliber machine gun is 128 lbs with the tripod. A minigun would weigh much more.
Actually the Browning M2HB .50 is 84lbs, with tripod. It is a heavy machine gun.
The GAU 19 is 74lbs, it is a gatling gun. The weight is without the power supply and feeder.
The Russian DShK is 78lbs, shoots 12.7 x 107mm Soviet Rounds, which is a very long bullet, it is a heavy machine gun, with the wheels and all that.
I don't think many if not all HMGs are 128lbs, a Minigun might be 128lbs with the Power Supply and all the heavy electronics.
But, I'm not sure if my info is accurate.