How is shooting a shotgun related to newtons third law? why does a rifle have less "kick" then a shotgun?

Newton's third law is a force is a push or pull that acts upon an object as a result of another object ... A shot gun when fired pulls back when a force (you pulling the trigger) is acted upon it. This is how it relates. A rifle has less kick than a shot gun because the rifle is smaller and has less of a force than a shot gun.