Originally Posted by Brutal Snail
Recently noticed when firing the AR 556, a loud rattling noise is coming from the stock or buffer, havent figured it out exactly yet. My question is should I replace the stock or the buffer/tube/spring? not a huge deal just annoying
If you're meaning the "sproing" that happens with each shot, that's your "magazine is not empty" indicator.
Once the magazine is stripped of it's last shot, and that last shot is fired, the sproing disappears. This is due to the bolt being held open by the bolt catch, which means there is no sproing, which means that your magazine is now empty.