Hi Rob,
By the time the Muzzle Brake was introduced (and rejected by Australia) the No.23 cover was already in Australian production: there was no requirement to change to a new design.
The Sept 1943 Canadian parts list shows two covers:
No.23 Mk.1 p/n CM1919 for guns without muzzle brake
C No.49 Mk.1 p/n CCM3916, for guns with muzzle brake, so this one was a Canadian design interchangeable with the British No.49, but modified to suit Canadian manufacturing.
The 1952 Australian handbook - 8/9 years before the muzzle brake was introduced into service - shows only the No.23 cover.
As an aside, the initial 25-pdr detailed drawings on which the Aust 25-pdr was manufactured in Aust came from Canada, not the UK. (A lot of this detail is in my book on the 25-pdr) Australia didn't prefix its part numbers with an "A" like the Canadian "C" for interchangeable parts and accessories.
Mike
Last edited by Mike Cecil; 12-03-22 at 18:07.
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