Do you see anywhere on that machine that 10 HOURS of 50 cal ammo could sit? Along with a battery pack or even fuel tank that would last a week?
Most importantly, these machines are not even needed to fight for 10 hours. It would be perfectly acceptable if they can fight for 30 minutes as a group, with up to 1,000 rounds per gun. The reinforcements cannot be farther away than that.
Along with a battery pack or even fuel tank that would last a week?
If these robots are intended for guard duty, they don't need to patrol continuously. Patrolling is useful only when you don't have enough sentries. Everything else in a moving patrolman is a disadvantage. A robot could remain motionless during most of the shift, running on batteries - and that won't require too much energy. In the active phase the robot could start a small gasoline engine; then it would have enough power to move around.
At 400 rounds per minute, 10 hours would be 240,000 rounds.
That’s a whole lot of weight and bulk.
2,285 standard 50 cal boxes.
The ammunition supply appears to be the box on the right. It could hold maybe 2000 rounds of belt-feed. Enough to hold out until reinforcements show up.
Hardly 10 hours worth. That's just marketing hype by the Russian arms industry lobbyists.