So I picked up a pair of Ameriglow fiber optic sights for my Glock and the front sight didn't come with the screw so I assumed they wanted me to use the factory screw but it seems to be a different thread size. Screw will not go into site. So since I don't have a top that's the size of the screw I'm left wondering what to do I don't even know what size the screw is but it appears to be a metric pitch .5 and 2.4 mm diameter