The M2 .50 Caliber Machine Gun, Heavy Barrel is frickin' heavy.
The gun weighs 84 Lbs. It is so much easier to separate the barrel from the receiver and the tripod. The gun should be carried in three separate pieces plus the ammunition.

Receiver: 60 Lbs.
Barrel: 24 Lbs.
Tripod: 44 Lbs.
Can of Ammo (100 rounds): 35 Lbs.