you pulse the trigger every time you hear the hit marker sound. 2-3 of those and there down. select fire could be use for the beginners using the gun... or lazy people who dont want to find the rhythm of using it.
FMJ is far more useful because it becomes OP is the hands of a skilled player
FACT if somehow everyone on gamefaqs was mailed a $100 bill, tons of topics would come up with people complaining that theirs was wrinkled