This Remington manufactured open (rear) sight screw is for the model 510 Targetmaster bolt action rimfire rifle and is in very good condition with light wear.  (file photo)

Note: Remington model 510 Targetmaster rifles with the following date codes (month and year of manufacture) have been observed with this part:

1939: PH (June 1939) & RH (November 1939)

1940: LJ (February 1940) & PJ (June 1940)

1941: EK (October 1941) & RK (November 1941)

1942: LL (February 1942), CL (April 1942) & OL (July 1942),

1946: XRR (December 1946)

1947: LSS (Feb 1947), PSS (June 1947) & ESS (Oct. 1947)

1956: AC (March 1956)