Hello Manfred
The square block with the round recess in the front is for the muzzle of the bren to rest in when stowed in the front and the back of the gun rests in a bracket on the steading handel .
The holes in the sides at the back are for brackets to rest different guns in. Depending on what you carried as to where you put the brackets.
The small bracket at the back is for fitting a sutton harness seat belt onto. As yet I have not come across any one who has ever seen seat belts fitted.
Thanks stephen
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