Three-Round Burst

I've explained the benefits of a three-round burst at least four times in the past week, so I'm stealing a quote from Wikipedia and putting it here:

The recoil in the three-round burst is not felt by the weapon's user until after the third round has left the chamber. This is accomplished by having the barrel and feeding mechanism "float" within the rifle casing. When the bullets are fired, the barrel and mechanism recoils back freely several inches and only when it hits the plate at the back of the rifle does the user feel the recoil. During this transit time the rifle loads and fires 3 rounds. When the barrel and mechanism reaches the back, springs push it forward into its normal position. When firing in semi-auto and full auto modes, the rifle only loads and fires one round per transit of the barrel, cutting the rate of fire to a controllable one-third of its maximum rate.

- From the page on the G11