>>The EFFECTIVE rate of fire for well trained shooters with a M16 A3 (3 round bust) and later is 40-60 rpm.
>
>I don't know what you mean by "effective". I've seen videos where the same weapon is fired with a lot higher rpm than that.

But not for long. https://www.youtube.com/watch?v=fO18uWPcnko
This gives the technical aspects - it is for 7.62 but the principles are the same. https://www.sciencedirect.com/science/article/pii/S2214914714000385
The 40-60 is about 2 magazines/minute.

fO18uWPcnko