On the heels of my previous post of the cycle of operation of the AR-15, here is one of the Glock 17 for your viewing pleasure. This truly helps the shooter and the armorer to understand how each part works with each other and to assist in diagnosing any problems that may crop up.
Have you ever been to the range with your handgun and you cannot hit where you are aiming, but still have a solid or semi-solid grouping of where your shots are? The problem is probably not your sights. Check out the diagnostic charts below (one for righties and one for lefties) to see what your problem may be. The charts are intended to use the center circle for where your point of aim is and the pie-shaped wedges around it to diagnose where your rounds are actually striking.