This product is specifically designed for semi-automatic rifles that need cleaning from the muzzle and includes an integral Oilite bearing to minimize rod wear. Ruger 10/22 precision muzzle alignment guide for enhanced barrel stability and optimal projectile trajectory Constructed with heavy-duty Delrin material Compatible with all .20 Cal or .22 Cal J. Dewey cleaning rods Compatible with Ruger 10/22 and 77-22RS models, including those equipped with rings and a ramp front sight