Quoted: I find the adjustment of the front sight ( 1 click about 4.8 cm @100 m) a little bit coarse. I'm thinking to file 4 extra slots on the front sight post so that I would have 1 click = 2.4 cm. Does it make sense to you?
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Depends. If you have the round front sight post I don't see an issue (the clicks will be 1/2 moa for a 20" barrel - meaning you could zero within 1/4" at 100y).
It won't work with the square front sight post as turing the post halfway would give you a WIDER front sight and you'd lose the flat (non glare) surface so desired for precision shooting (which is the only reason for the finer adjustments).
If you're looking for a fine precison match rifle - replace the sights with fine precision match sights. Otherwise you might as well keep it as is.