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Old August 28, 2012, 03:25 PM   #1
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Join Date: October 18, 2008
Posts: 10
Win M70 MOA Trigger Jamming

I hope someone here can give me some tips on what appears to be a trigger problem. I have a new Ultimate Shadow M70 in 338 Win Mag. Never fired (other than dry firing). I got it NIB off a GB auction. I dry fired it a few times upon arrival and immediately put a new lighter trigger spring in it from Ernie and adjusted the MOA's set screws to around 3 lbs. pull and minimum over-travel necessary to get trigger release. The trigger passed the "whack the buttstock hard on the floor" test.

I don't know if it had this problem before I made the changes but every dozen or so pulls of the trigger, the trigger jams after cycling the bolt for the next pull when dry firing. I tried backing out the set screw to increasing the over-travel significantly but no improvement in trigger reliability.

Upon removing the trigger housing after each failure, The actuator appears to be jammed in the "trigger released/pulled" and it is holding the trigger firmly in the trigger back position. When I attempt to move the actuator with a small pin punch, I can move it back and forth, but I can feel that it is binding on something. When I punch out the roll pin to remove it, it comes out fine and I can't find anything wrong (marks on it, etc.) It installs back into the housing perfectly and functions normally upon reassembly--for several more pulls of the trigger until it jams again.

I removed all the trigger components from the trigger housing last time but see no signs of the origins of the jam. Maybe someone else has had experience with these symptoms. Maybe I should polish all the surfaces, coat with layout blue, and reassemble.

Thanks for any advice, experiences, or tips!


Last edited by calinb; August 28, 2012 at 03:50 PM.
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