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Thread: Bolt Dragging on Trunion entrance

  1. #1
    Gunco Member PullThru 1948's Avatar
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    Default Bolt Dragging on Trunion entrance

    Going a little nuts on this one.
    The Rifle fires and Cycles. Cleaning and manually cycling the Right Bolt lug stops as it enters the trunion .
    Checked/measured everything I can think of, can't fix it.
    Rails are fine, ejector not to long, Trunion not canted etc etc.

    What makes it even worse, is with two other rifles I can put the BC+Bolt in the troublesome action and there's no drag, smooth and loose.
    Even using a Spare Galil B.C (a Little tight) Bolt slides right on in.

    It has to be the carrier ??, but what ?

    Also, Carrier by itself is free all the way, as is the Bolt by itself.

    Any ideas folks.

    Hope you can follow what I'm attempting to illustrate.
    Been a long hot day , so forgive, if it's as "clear as mud"

  2. #2
    Gunco Regular allesennogwat's Avatar
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    Is the bolt contacting the bullet guide?

  3. #3
    Gunco Member PullThru 1948's Avatar
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    Yes, at the point it rotates.

    The middle pic. is where it is still free moving.

    The bottom pic. is where the rubbing starts.

    I've Lapped the hell out it with Lapping Compound. The contact is even on the Lug.

    Was tempted to Mill off a thou. or two off the the the Lug top.

    Didn't though.
    Attached Images Attached Images

  4. #4
    Gunco Regular akblue's Avatar
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    Did you polish the upper left of the top of the carrier or is that wear? Is the carrier riding up into the RSB when the bolt is in place etc?

  5. #5
    Gunco Member PullThru 1948's Avatar
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    Quote Originally Posted by akblue View Post
    Did you polish the upper left of the top of the carrier or is that wear? Is the carrier riding up into the RSB when the bolt is in place etc?
    Yes and No ! ?

    I never had "wiggle" in the Piston , so decided to remove Piston, chase thread in an attempt to get it.

    Just a Strip of Emery and lightly rubbed over it. Habit that's all. It's going to be re-Phosphated anyway.

    Carrier runs true into RSB, almost dead center with and without Bolt.

  6. #6
    Gunco Member PullThru 1948's Avatar
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    Thanks for the pointers Guys,
    It's fixed.

    Compared Bolt with a couple of others and two spare Galil Bolts I've got stashed.

    I was wrong on the carrier being the cause. All other Bolts, including the Galils slid into full rotational lock position under gravity only.

    Armed with this "knowledge" , I thought I pull out my Secret Weapon-------Newly acquired Harbor Fright Magnifying headset with interchangeable lenses.

    Saw a little ledge on forward upper of left Bolt lug , which I'd overlooked previously.

    Few strokes with a stone, problem gone. Surprised though all the Valve Grinding compound didn't take care of it.

    Thanks again.

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