The ramp worked as expected. The reason I did not give it five stars is the screw has a very narrow and shallow slot. A jewelers screwdriver or a European bit has to be used. A standard bit, even a thin one, will not fit. I used the 180-1 bit. Be careful not to damage the slot by over tightening or letting the screwdriver slip out of the slot. Be sure to order a front sight with a width of 0.25\" or the sight will be too wide for the ramp.