How does Newton's third law apply to a rifle firing a bullet?

Bullet fired -action, recoil of the gun-reaction. when a bullet is fired from the gun, the force of the internal explosion in the gun fires the bullet forward as a projectile. This is considered as action. The sudden recoil of the gun caused by the internal explosion seen hence is the opposite force applied by the explosion. Thus is applied.

Newton's law-For every action, there is equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.

Many people are familiar with the fact that a rifle recoils when fired. This recoil is the result of action-reaction force pairs. A gunpowder explosion creates hot gases that expand outward allowing the rifle to push forward on the bullet. Consistent with Newton's third law of motion, the bullet pushes backwards upon the rifle