There are five Olympic pistol events. Men's and women's 10 meter air pistol, women's 25 meter sport pistol, men's 25 meter rapid fire pistol, and men's 50 meter free pistol. Only open iron sights are allowed in Olympic pistol events. Also the shooter must be in a standing position without any support. The pistols held and fired with one hand only. There are strict rules that apply to the overall size of the pistol, trigger pull, weight, and the pistol grip design in all events. The 50 meter free pistol event is a men's event. As the name implies, the pistol is basically free of any rules or regulations, except that it must be safe to shoot, use only open iron sights and 22 caliber. The target is placed 50 meters from the firing line. The center 10 ring is 50 millimeters in diameter. The free pistol event is 60 competition shots fired with a two hour time limit. A total maximum score of 600 points is possible. A competitive world class score for free pistol starts with a score of 560 or better.