Gauge Inspectors Selected Breech Bolt No1 Rifle

[jss]

Could a New(ish) No4 bolt be used on No4's as a substitute to some degree?. i.e. would they be manufactured to the same tolerances.

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[Son]

Thankyou Thunderbox and Peter!
Would it be possible to combine the two posts into an MKL entry on the topic? It would be very handy to be able to reference it to help persuade potential reactivators of DP rifles that there is more to headspace than the length of the bolt head,