Is this a Mk5 bolt

[Alan de Enfield]

No, the hollow bolt knob...

But some No4's had hollow bolt knobs as a variation of manufacture - it was used as a 'location' point for tooling.
The trick is to recognise which 'hole' is which'

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[browningautorifle]

The trick is to recognize which 'hole' is which'

That's true.