I don't understand that Mk7........ If we/UK were making them, they'd be in use in our 60's and 70's tanks and other AFV's surely? That cross pin retaining method is nothing I've ever seen before on machine guns. And we'd be using the standard Vckers method - and the Vickers type chain that came from Ordnance in 12" lengths.
I don't know of course but just putting across the negative sideInformation
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