Prior to installing your chassis on your rifle, please inspect the condition of your head-space pin. We have had a few customers inform us of their rifle coming from the manufacturer with the head-space pin not on center. If your head-space pin is not centered in the machined recess as shown, it may cause interference between the bedding surface and your rifle's receiver. This will mar your new chassis and cause poor accuracy. The image in the link below is how your head-space pin should look on both sides of the rifle's receiver. If you experience this, we recommend you consult a experienced gunsmith to have the pin centered. If you have any concerns please send us a question or comment to info@rigidalloy.com