My SP101 was shooting low and I "fixed it" by filing down the front sight a bit. It is a permanent fix, so you have to be careful. The nice thing about the SP101 is that a replacement front sight blade is not that expensive and can be purchased from Ruger. Think a spare was less than $20 when I bought mine. If you decide to trade or sell the gun, you can pop the new one in. (There is a pin that has to be removed to do so).