Bolt Assembly

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   I took my rifle to a gunsmith to get it checked out and he told me I will need a new bolt head and firing pin because they were really beat up. I have a number 4 MK1, but he told me I will need an MK2 bolt which confused me. My questions are 1. would an MK2 bolt work? 2. Could I keep the bolt I currently have on there and get the firing pin and bolt head or should I get a new assembly entirely? Finally how can I check the size of my bolt head to make sure I buy the right one? 
Thanks. 

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44_4_MK1 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: January 08 2021 Location: Chicago Status: Offline Points: 13	Post Options Post Reply Quote 44_4_MK1 Report Post Thanks(0) Quote Reply Topic: Bolt Assembly Posted: January 12 2021 at 12:04pm
	I took my rifle to a gunsmith to get it checked out and he told me I will need a new bolt head and firing pin because they were really beat up. I have a number 4 MK1, but he told me I will need an MK2 bolt which confused me. My questions are 1. would an MK2 bolt work? 2. Could I keep the bolt I currently have on there and get the firing pin and bolt head or should I get a new assembly entirely? Finally how can I check the size of my bolt head to make sure I buy the right one? Thanks.

WilliamS Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: March 30 2020 Location: Camas WA USA Status: Offline Points: 329	Post Options Post Reply Quote WilliamS Report Post Thanks(0) Quote Reply Posted: January 13 2021 at 11:40pm
	I'd take it to a different gunsmith for starters. Is he using SAAMI spec gauges or proper military spec ones? SAAMI gauges are I think .004" shorter than military on the No Go. Secondly, all No4 and No5 bolt parts are interchangeable. Also, as long as the bolt head passes overturn, headspace, and firing pin hole checks, and the firing pin has correct protrusion, no bends and good threads, it is fine if they look beat up. Do not get a new bolt body. The bolt body must be individually fit to the action body. That is why the bolt handle is serialized.

britrifles Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: February 03 2018 Location: Georgia, USA Status: Offline Points: 8404	Post Options Post Reply Quote britrifles Report Post Thanks(0) Quote Reply Posted: January 14 2021 at 4:56am
	I suspect he was talking about a #2 bolt head, not a “Mk 2” bolt. Is there such a thing as a Mk 2 bolt body? As William S said, keep the bolt, it should have the same serial number on the back side of the handle as the serial number on the receiver, indicating it was fitted to the rifle. Did he check headspace?