The fit was plenty tight enough to prevent blowback but it was not difficult to close the bolt. I wonder if I need to find the right sized little washer to put in where the primer goes to make it stick out a little further and get smacked harder by the firing pin. I am not saying I'm not happy with the setup I just need to figure out how to make the ignition flawless. I think the difficulty is that not all the Knight rifles are the same.