How many rounds does a M4 shoot per second?

In full auto mode, rate of fire is between 11 and 15 rounds per second- HOWEVER- that is not the actual rate of fire. The M4 has a "triburst" selector- pull trigger, fires 3 shots, stops. Pull trigger again, 3 more shots. Actual rate is about 5-6 shots a second. The magazine only holds 30 rounds, so you will have to stop and change magazines.