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Thread: 1898 Headpsace Out of Whack

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  1. #11
    Advisory Panel browningautorifle's Avatar
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    Let us know how this works out...
    Regards, Jim

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    Member Potashminer's Avatar
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    As alluded to in earlier posts, the Go and NoGo gauges are used when installing a barrel. To check if rifle is still "within spec", then one uses a Field gauge, which is longer than the NoGo gauge. I have no experience with the Krags, but I believe the "Field" gauge, either pass or fail, is the "test" for whether a rifle's headspace is "safe" for continued use or not. Britishicon, American, Russianicon, Germanicon, etc. If it fails, then investigate why (Receiver lugs set back? Bolt lugs worn? Chamber worn or stretched) and respond accordingly. Several of these issues mean the receiver, bolt, or barrel, or all of them, are trash.

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    Really Senior Member butlersrangers's Avatar
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    It use to be a practice among some professional and amateur gunsmiths to 'Lap' the rear of the single lug on the U.S. Kragicon Bolt.

    The intention was to allow the rear of the Bolt's 'Safety/Guide Rib' to make contact with the receiver, when the Bolt was closed.

    (Danishicon and Norwegianicon Krag rifles were manufactured to have this 'rib' contact. U.S. Krag Bolts had a few 1/1000" clearance).

    IMHO - This 'Lapping' may have made the U.S. action slightly stronger, but, it also likely introduced more 'head-space' or 'free-travel'.

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    Advisory Panel browningautorifle's Avatar
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    Quote Originally Posted by butlersrangers View Post
    This 'Lapping' may have made the U.S. action slightly stronger, but, it also likely introduced more 'head-space' or 'free-travel'.
    Agreed, opens up the headspace.
    Regards, Jim

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    Really Senior Member butlersrangers's Avatar
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    IMHO - A U.S. Kragicon bolt should show some clearance, (approximately .001" to .004"), between the rear of the Bolt's 'guide rib/ safety-lug' and the receiver. This appears to be how Springfield Armory built them.



    If the rear of the 'Safety Lug' bears against the receiver, it is likely there is locking-lug wear, 'lapping' of locking-lug, or 'movement of metal'.
    Head-space should be checked with a Field Gauge.


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