Both of my No.4 Mk.1* rifles have failed the no-go and field guages. They both have #1 bolt heads. Am I correct that replacing the bolt heads with higher numbered ones will/might fix the problem? If so, I have a couple of questions: How can I determine which bolt head (#2 or#3) will yield correct headspace? Where am I likely to find them?

Thank you for your help.

Mike
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