What is the third step in the functioning of an M4 Rifle?

The third step in the functioning of an M4 Rifle is locking. Understanding the firing sequence of a firearm, particularly the M4, is crucial for its proper operation and maintenance.

During the firing process, when the trigger is pulled, the hammer is released and strikes the firing pin, which then ignites the primer of the cartridge. Following this, the round is propelled forward into the chamber. After the round is fired, the next step is to unlock the bolt from the barrel extension. This is not the third step, as the first two steps involve firing and the initial movement of the bolt carrier group as it begins to cycle.

Locking occurs after the bolt has been fully rotated and the cartridge is secured in the chamber, ensuring that when the firearm is fired, there is a complete seal that allows for effective propulsion of the bullet. This stage is crucial for the reliability and safety of the weapon, as it prevents the round from moving or becoming dislodged while the gun is being fired, thereby maintaining the integrity of the firing process.

Hence, the locking step is a vital part of the M4 Rifle's operation, and understanding this sequence helps users appreciate the mechanics behind this firearm, ensuring safer and more effective handling during its use.