Lester, I think your shorter box for the MK3 maybe due to a certain dealer selling old Indian Mag 58 boxes as Bren Para Bren boxs, as Peter has said, as far as I'm aware, the Mk3 was supplied in the normal length box as that is what we had, and these could be used for all marks with very little modification. Also, the Inglis Mk2 was the same length as the Britishicon Daimler/Monotype Mk2, Both used the butt plate with the over hang to start with. I can also confirm that with the exception of the early Bren Mk2s overhang butt plate, all my Mk2s, Mk1s, Mk1As, Mk1ms from Inglis, Enfield, monotype and Lithgowicon are all the same size to within millimeters.
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