This racking discussion focuses on racking the slide on semiautomatic pistols. For anyone not familiar with the terminology, racking the slide refers to vigorously drawing the slide all the way back in order to eject a chambered cartridge or spent casing and/or allow the slide to strip a new one from the magazine and jam it into the chamber. In plain English, racking most often completes the process of manually loading a semiautomatic pistol by moving the first round from the magazine to the chamber.
This fifth entry in to the deadly sins series discusses racking the slide.
Head on over and read the entire article: http://www.outdoorhub.com/how-to/the-seven-deadly-sins-of-handgun-shooting-inappropriate-racking/