I'm offering a tip to those that are new and old timers owning any gun with sight or other optic. I recently put my gun in the shop to switch out sights from a Dot-n-Post to a Target adjustable. When i got it back I wanted to see if it was on... I have mainly 9mm's so I bought a 9mm lazer cartrige from a well known supplier. Following all the safety and printed instruction i used it and found out where each of my pistols center was. I also found that the money paid to switch out the sights was not to sight it. Using this lazer cartrige to find each pistols center, I have been on every time, every gun and saving ammo sighting in. :thumbup: I would like to see other basic fixes to help the gun owner that can make a difference.