One more point, full auto is over rated since most of the time you will end up shooting at the moon anyway. I think that 3rd bursts are the way to go. I think that the AKs are really good weapons though too...
Yes, these weapons are likely safe, semi and 3-round burst. I was thinking more along the line of *not* semi auto only.
I never learned three round burst. I was always taught that when going full auto, be it M16 or cal 50 one should never start center of mass (COM) but rather start low and walk rounds up the body. In engaging a vehicle use a "Z" pattern and start low.
IMHO 3 rd burst in 5.56mm is the same as a single shot on target with 7.62x51 (.308). Which is more efficient? I personally don't like 7.62x39 (AK ammo) since a whole lot of the stuff available from overseas (savings is a factor here) is corrosive. Also, I don't own an AK and probably never will so for me the point is moot.
Then go with this:
FN P90. You can empty a 50-round clip at 900 rpm into a target at 50 meters, with a 10-inch group.