i use one of my kids laser light (laser pointer). find a way to keep the light shining down the inside of the barrel so you can adjust your scope. i used paper coin rolls and wedge it into place. after that i just adjust the cross hairs to the dot (about 40-45 paces). then take a shot at 25 yards to make sure i hit paper, then i shoot at a farther distance, and adjust from there, which is usually only elevation.