Return to Zero Guaranteed quickly detach and reattach the Ruger QD rings with no loss of zero. - Indexable lever allows placement of the levers in any position desired. - Ruger specific scalloped recoil control key for positive engagement of ring to receiver dovetail. - Rings securely mount around scope using 4 Torx style T-15 socket cap screws 25 in/lb. of torque recommended.