I don't know much about these, but here's an excellent site to bookmark for reference material and background on Parker Hale sights, Enfields, small bore target rifles and other old milsurps.

The U.K. NRA Historic Arms Resource Center (Click Here).

For example, in searching for a clear explanation of your rifle's "Parkerifled - AGP" markings, I found this.

Attachment 971(Click PIC to Enlarge)Attachment 972

Regards,
Badger
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