unless some has been filing on the front sight you have, it should not be the problem,
there are only 2 front sights available (from uncle sam) for the M1, the standard sight, and the NM sight,
all the makers made them to the same spec,
I would give the entire gun a detailed strip, including the rear sight,
then try the tilt test to be sure the op rod is not rubbing,
and of course, try some different ammo (LC or HXP if you can find it in your area)
there are only 2 front sights available (from uncle sam) for the M1, the standard sight, and the NM sight,
all the makers made them to the same spec,
I would give the entire gun a detailed strip, including the rear sight,
then try the tilt test to be sure the op rod is not rubbing,
and of course, try some different ammo (LC or HXP if you can find it in your area)

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