Yes, it is a select fire weapon.( semi-automatic, three-round burst and full-automatic fire. )
the standard m16 shoots the 5.56mm, but it can be converted to shoot 9mm, 7.62mm, even .308
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Especially if hunting - GO NRA!
The cyclic rate of fire of the M16 assault rifle is 700-950 rounds per minute.
Sasme as the M16. 5.56x45mm
The M16 assault rifle is chambered for the 5.56x45mm NATOcartridge. Most can also fire the civilian .223 Remington cartridge.
The m16 rifle is a select fire weapon. Select fire means it can be fired in the semiautomatic mode (1 pull of trigger= 1 shot) or it can be fired in the fully automatic mode (1 pull= shoot until trigger is released) The currently issued M16 is equipped for "burst" fire. When the selector switch is set to Burst, 1 trigger pull= 3 shots.
The M16 assault rifle has a cyclic rate of fire of 700-950 rounds per minute, and 45-60 rounds per minute in semi-automatic fire.
5.56,hope i helped,by the way my favourite rifle is the m16a2
AR 15 - semi-automatic only M16 - depending on variant capable of full auto or burst fire. Will also fire semi-auto.