This Remington manufactured one piece scope mounting base and four mounting screws are for the model 770 bolt action rifle in non-magnum calibers and are in very good condition with light wear.  (file photo)

Note: Remington model 770 rifles with the following serial numbers have been observed with this part: M71661216, M71685872, M72083803 

.243 Win: 72083803

270 Win: H70000776, H70017624, H70038356, H70043516, H70056582, M72146158, M71664845

30-06 Sprg: M72163671, M72150174 & M72152449

7MM Rem Mag: M7211587

300 Win Mag: H70014540, H70052126 & H70005745