Try to see this thread, post # 2:
https://www.milsurps.com/showthread.php?t=55576
The 79 ^ GA mark is simply a post war inspection mark. You will find that type of mark, with different letter and number combinations, on the wood, receiver and barrels on all BSA post war FTR's and new made/FTR rifles done by Fazakerley.
David