The sights are by far the worst aspect of the Model 42. Personally I found them all but unusable as the rear sight has a very narrow window in it and the front sight is cone shaped and very wide so you can never get a consistent, precision aiming point with them. They're adequate for the .410 barrel, but all but useless with the rimfire barrel in my view.
As far as durability goes though I really don't see where that would be a problem as they're made from a very rugged polymer.
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