Hello hope this helps
• Normal Setting: Around 700-850 RPM.
• Adverse Setting: Increases to 950-1150 RPM
Normal GI. issued magazines work well.

The cyclic rate is between 700 - 850 rounds per min (rpm), it can vary slightly. It’s often stated as around 850 rpm with a fresh barrel or 750-1000 rpm depending on the gas setting and overall environment. You can also use standard AR magazines.

Hi Karl and welcome. The cyclic rate for the M249 is generally between 700 to 850 rounds per minute (rpm), though it can vary slightly by source and conditions, often cited as around 850 rpm with a fresh barrel or 750-1000 rpm depending on gas setting and environment. Yes, you can also use standard AR style magazines no issues. Cheers, stay safe and happy holidays!

Hi Karl, M249 Specifications -
Cyclic Rate of Fire
Cyclic Rate: The M249 has a cyclic rate of fire of 850 rounds per minute. This rate is the maximum firing speed under ideal conditions, without considering factors like overheating or ammunition constraints.
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Magazine Compatibility
Standard Magazines: The M249 is primarily belt-fed but is also compatible with STANAG magazines, which are the same magazines used by the M16 and M4 rifles. This allows for flexibility in ammunition feeding, although the belt-fed system is its main design feature.
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Stay safe & have a great day!

I suppose it depends on how fast your finger is.