I agree with Rob, I wonder if the inner bag was used on its own when the gun was used in other roles. However if the rigid version was intended to stay in the vehicle, to protect the contents from the weather and damage, one would expect a metal box bolted to the hull. I suppose it is possible that this was just an intermediate solution to the problem, taken over from pre-carrier thinking in the same way that FATs were designed to directly replace horses, with the stores still in a limber, rather than a truck that towed the gun directly.
David
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