Bathurst began component production 24th September 1941, the rifle in question would not have been assembled till 1942 so if the receiver was made in the last few months of 1941 then BA on the charger guide would be correct, i have a BA marked charger guide on one of mine but its a '42 action assembled in 1943 s/n D38xxx.
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Yep, both the cut-away & the 1935 with a barrel date of 3 '36