So what would a Mk 1 1944 Enfield Bren have when it came off the production line ie, a Mk 1 butt stock etc or would it have the latest improved butt stock available at the time ie a Mk 2 stock etc, which I assume would be better than the Mk 1 version. I can understand how later improved features were added during a refit and overall. Just wondered if improvements were added on the production line.