What are the 8 cycles of function for the M4 rifle?

• A. Feeding; Chambering; Locking; Firing; Unlocking; Extracting; Ejecting; Cocking
• B. Feeding; Chambering; Firing; Locking; Unlocking; Extracting; Ejecting; Cocking
• C. Feeding; Locking; Chambering; Firing; Unlocking; Extracting; Ejecting; Cocking
• D. Feeding; Chambering; Locking; Firing; Unlocking; Ejecting; Extracting; Cocking

Answer: (A)

Understanding how a semi-automatic rifle cycles is about the sequence the action goes through to fire one round and prepare the next. In the M4, the standard eight-step cycle is feeding, chambering, locking, firing, unlocking, extracting, ejecting, cocking. Feeding moves a cartridge from the magazine into position. Chambering seats that cartridge in the chamber so it’s ready to be fired. Locking secures the bolt to the barrel so the high-pressure gas can act on the bolt without the action opening prematurely. Firing happens when the hammer strikes the primer and the round fires, driving pressure that also drives the bolt rearward. Unlocking begins the rearward travel of the bolt so it can move freely. Extracting pulls the spent case from the chamber. Ejecting sends that case out of the weapon. Cocking occurs as the bolt moves rearward and prepares the hammer/striker for the next cycle, and then the forward motion begins again to feed and chamber the next round. This order reflects the M4’s gas-operated rotating bolt design, where the cycle progresses in this sequence to reliably fire and reset for the next shot.