What function does the recoil spring perform?

The recoil spring plays a crucial role in the operation of semi-automatic and automatic firearms. Its primary function is to return the slide to its original position after it has been pushed back during the firing cycle. When a round is fired, the recoil pushes the slide back, extracting and ejecting the spent cartridge case. The tension in the recoil spring then causes the slide to move forward again, chambering a new round from the magazine and preparing the firearm for the next shot. This action is essential for the firearm to function properly and ensure reliable cycling between shots.

Other functions mentioned in the options relate to different components of the firearm but do not involve the recoil spring. For instance, firing the bullet is primarily performed by the firing pin or striker mechanism, locking the magazine in place is achieved through the magazine release latch, and aligning the sights pertains to the shooter’s responsibility for aiming rather than a mechanical function of the recoil spring.