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If its not the Browning .50 somethings wrong.
From my experience with this weapon platform, its not a Machine Gun its a automatic Cannon.
If not the m2 its kind of hard to beat 1500 rounds/min and under 10 second barrel change. So what was #1?
Thats not exactly correct, try 1/3 of that cyclic rate.
That gun would gernade itself at 1500 RPM.
Sustained: Less than 40 rds/min, in bursts of five to seven rounds
Rapid: More than 40 rds/min, fired in bursts of five to seven rounds
Cyclic: 450-550 rds/min