VERY100 Aluminum Weaver/Picatinny Rail Scope Mount 3 Slots 20 mm Rail for Rifles Easy Install Info: Red Bird M-1 Carbine scope mount requires no drilling or tapping to install Just drift/drive or pull out the rear sight and then replace the rear sight with the dovetail nut provided, then place mount over dovetail and fasten the mount to the receiver with the one screw through mount Carbine mount/sight can be easily changed back to its original configuration Mount made of Precision machined, durable, light weight aircraft aluminum Comes with 1 Allen wrench, 1 Allen screw & 1 dovetail nut