i did the exact same with my M305 - makes a world of difference when you can actually see the markings on the sights!
unfortunately i also cleaned and oiled my rear sight and now it moves far too freely.
i think im gonna have to put some thick grease in it to slow it down.... a light wind will pretty much turn the dial now.
Are you running the original Norc sights? If so, switch to USGI NM. World of difference.
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