Early 1954 HRA T-48 magazine

[RCS]

Photo show a survivor of the 1954 T-48 trials with a HRA marked 20rd magazine with a newer magazine for comparison. While this HRA magazine is not in the best condition, it appears everything works. Years ago I co-authored an article for one of the Gun Digest books concerning the HRA T-48 and High Standard T48 test rifles. I could never determine if the High Standard used the FN or HRA magazine or their own produced magazine ?