What is the maximum effective rate of fire for the M-16A4 in semiautomatic mode?

• A. 30 rounds per minute
• B. 45 rounds per minute
• C. 60 rounds per minute
• D. 120 rounds per minute

Answer: (B)

Controlling pace is the key. In semiautomatic fire, you fire one round per trigger pull and must quickly reacquire the target and reset your aim after each shot. For the M-16A4, the practical upper limit for aimed, effective fire is about 45 rounds per minute. That rate means roughly one shot every 1.3 seconds, giving you time to maintain sight picture, breathing, trigger squeeze, and recoil control between shots. Pushing faster tends to degrade accuracy as muzzle rise and the need to reacquire the target outpace your ability to stay on target, while also increasing ammo use and barrel heat without improving overall effectiveness. Firing more slowly than that wastes time without gaining accuracy. So 45 rounds per minute represents a sustainable, accurate pace for semiautomatic fire on the M-16A4.