Which machine gun has a cyclic rate of 550-650 rpm?

The M240B machine gun has a cyclic rate of fire that falls within the range of 550-650 rounds per minute (rpm). This versatility makes it effective in various combat scenarios, providing a steady rate of fire that allows for sustained suppressive fire during engagements. The M240B is a general-purpose machine gun used by the U.S. military, and its ability to deliver consistent and reliable firepower is one of the key attributes that contribute to its extensive use in various operations.

The M249, while also a popular machine gun, has a different rate of fire and is designed primarily as a lightweight automatic weapon, which influences its characteristics and operational role. Similarly, while the M240L has a cyclic rate that is comparable, it is slightly lighter and optimized for different use cases. The MK-48, another notable machine gun, has its own specifications that distinguish it from the M240B. Each of these weapons serves unique roles and is tailored for specific operational needs, but in terms of the cyclic rate of fire specified by the question, the M240B is the correct answer.