In which component is the action spring located?

The action spring is located in the buttstock of the rifle. This component is crucial as it helps facilitate the operation of the bolt carrier group during the cycling of the rifle. When the rifle is fired, the energy from the fired cartridge pushes the bolt carrier rearward, and the action spring compresses. As the bolt carrier moves back, it ejects the spent cartridge casing and then, when it moves forward again, the action spring releases to help chamber a new round. The design of the buttstock allows for this spring to be contained within it, thereby contributing to the overall compactness and reliability of the weapon system. This placement is essential for maintaining the balance and functionality of the service rifle, which is vital during operation.