6 Mil. Serial Block HRA Rifles

Anyone aware of any good articles on the 6 mil HRA serial block rifles?
Thanks and Happy Thanksgiving!

found this


1956

6,034,330 - 6,034,729

a small group of rifles - 400

Thank you, appreciate any and all help.

HRA had a 400-rifle overrun and delivered them in late 1956. This helped SA reach the agreed delivery total before terminating production. See the fourth item from the top in the list of serials assigned for exceptions. The total is 400 because you have to count both ends in the serial range to get the total.
Attachment 121690