The screw moves the sight. If you have a bit of "slop" (lash) then the threads may be partially stripped. I would recommend not trying to move the sight with your punch. Wait until you get your sight adjustment tool and make sure the front sight has had a generous soaking of penetrating oil to make sure it is not siezed. If you encounter a lot of resistance, stop, otherwise you risk messing up the whole signt assembly. Better yet, unless you have some real reason to move the front sight, let it alone. Just my opinion
.