1939 Enfield Bren - a spot of help please

[lugerfan]

Thanks guys, will try to get some better photos tomorrow in a good light (any specific areas to concentrate on?) . It was deactivated in 2014 so it could well be. It's got DP on the barrel and also on the rear by the upper serial number.
The upper, lower and barrel nut all match, the barrel has a b block serial number on it as well (faintly struck through) and the same number as the rest then stamped on. Looks like a light black coat of paint has been sprayed over the barrel around that areal, so that may have been to cover the welded holes.

What is the story behind the recent Irish release, were they all drill purpose weapons?

Any thoughts on 40 dated inspection mark ?

Thanks again for the comments