CWS on L42A1

[waco16]

Are you sure ?

I'm obviously not the only one to get it wrong.

Yes
The only night sight used in service on the L42A1 was the L1A1 IWS, mounted to the rifle using the L5A1 mount

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The 'L' designations used in weapon/sight terminology can be confusing, with the same designation used for different items (L1A1 can refer to the SLR, the IWS etc etc) - this link goes some way to describing how they were used:

List of British weapon L numbers - Wikipedia

But in the case of the L42A1, the Image Intensifier was L1A1 and its mount was L5A1