sentences:  In the case of a vertical forward grip on a pistol, the law does not explicitly define such a feature as belonging to any category.In May 1993, in response to legal action brought by the Bureau of Alcohol, Tobacco, and Firearms (ATF), the South Carolina District Court's finding of fact concluded that a pistol modified with the addition of vertical fore grips was still a pistol and not any other weapon device.Following this, the ATF dropped their charges and the case was not tried; as such no precedent was set.