British Army 7.62 mm L1A1 Boresighting Device

I'm sorry Peter...won't 9/16 X 24 be an Imperial? It IS for one of the Queen's barrels isn't it?

Peter,
Definitely Imperial as I only do old coinage and measurements............especially at my age :super:

Is it me.......... But WHICH imperial thread pitch chaps. There's more than one and contrary to what you all believe, the L1A1 wasn't actually 'imperial' overall. It was a hotch potch of both thread types and measurements. Just try rethreading the foresight blade with an imperial thread and see what happens or the........ and the............. and

Quote:

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Originally Posted by Peter Laidler

But WHICH imperial thread

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Yes, I follow...