Class IIIa 635nM Less Than 5mW, Avoid Direct Eye Exposure to Beam. Precision Laser Optics How to sight Steps for usage 1. Secure the rifle on a table so that it will not move (aiming the barrel down range). 2. Turn on the sight and insert it into the rifle. 3. Mark where the laser dot appears on the target(white paper) using a pen. 4. Rotate the bore site while it is in the chamber 90 degrees and mark the laser dot position on the paper. 5. Repeat step 4 two more times until you have 4 marks on the paper. 6. Connect the dots to make a cross, the cross is the center of the barrel. 7. Adjust you sights to the center of the cross. -- Done