ORIGINAL: M77man
It's semi-auto or with the flip of a small switch becomes a 3 round burst (which is worthless).
I wouldn't call the 3-round burst worthless. Its puts 3 rounds into the chest of the enemy much more accurately then full auto. I'll take 3 shots in a 4 inch target with one trigger pull than 3 shots in a 2 inch target with 3 trigger pulls. JMHO