The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Guns, Politics, Gunsmithing & Reloading Gunsmithing What’s going on with this Mk10 bolt?Go | New | Find | Notify | Tools | Reply | |
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| One of Us |
I recently acquired this Mk10 bolt. It has an unusual length cocking piece, and a corresponding alteration to the cocking cam on the bolt resulting in the firing pin moving back less. Works perfectly in an FN action with Sako trigger, but doesn’t feel right in a 1937 Portuguese with military trigger - notchy on the uplift in the final stages. Does any one know why this was done (some form of speed lock?) and what it was called? I bought it mostly as it had the right bolt face    | ||
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| one of us |
Try swapping a military cocking piece. | |||
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| one of us |
Yes that is a early speed lock change they did in the later production Interarms Mark X bolts You have to keep that cocking piece with that bolt so the cams match up Have seen some rough cuts on those, but the cams can be honed/lapped in for smoother operation Have one of those actions in the shop now, just installed a M70 safety to it and am barreling it to a 458 Win Mag for the customer So very close to the current Zastava M70 bolt and cocking pieces Also the FN cocking piece you show appears to be from a JC Higgins M50, as it has the angled sear face Jim Wisner | |||
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| One of Us |
Have personally seen two of those "speedlock" cocking pieces fail (brake) Either outrageously hardened or perhaps a casting..the nose is just hanging out there a bit far | |||
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| one of us |
They are harder than Wood Pecker lips. I have to use a carbide end mill to cut them when installing a M70 safety and even then its a hard job. Jim Wisner | |||
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| One of Us |
This doesn’t work - see the photo of the cocking pieces, unlike FN and standard military they’re incompatible with this speed lock set up thanks a lot Jim, I was pretty stumped by it and suspected a speed lock idea with nothing else I can see being gained by reducing travel. As a separate note - the FN CP is off a Stirling, which was a name used by Fuller Firearms. It has a Sako #4 trigger, with a rather alarming slope on the sear where it contacts the cocking piece - is this normal? | |||
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| One of Us |
thanks for the input | |||
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The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Guns, Politics, Gunsmithing & Reloading Gunsmithing What’s going on with this Mk10 bolt?
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