I thought it might be usefull, to post some pictures and information on the different marks of Bren gun and the spare barrel holder and spares wallet.
This first gun is a 1938 Mk1.It has the correct Mk1 barrel,drum type rear sight, dovetail slot in the body, intended for a fixed line sight, extendable bipod, early B.S.A. butt, with butt handle and butt strap.
The spare barrel holder contains a spare breech block and the wallet has the early combination tool. It also has the early pattern cleaning rod with screw on brushes. Note the early pattern of oil tins and brass oil bottle. A lot of these things changed later in the war as economy measures.
I will add other marks shortly.