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My "new" 1945 M1 has a lock bar sight. It is either tight and won't turn or loose and turns with shooting. I have to loosen, set, tighten, shoot. Is this normal. My first M1 so I am still fumbling a bit.
 

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The lockbar modification was in response to problems with the earlier rear sight working loose/moving while firing.

You loosen the bar on the side of the windage knob enough to allow easy adjustment of the sight with the elevation or windage knobs and then tighten the lockbar after you've made your adjustment.

The lockbar should not work loose once you tighten it down with your fingers.

It that how you're using it.
 
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