Vertical forward grip
A vertical forward grip is a vertical grip that is designed to attach to a firearm for the forward hand (or "off hand"). These aid in the maneuverability of the firearm, since the natural angle of a person's outstretched hand is more oriented to grasping objects at a vertical angle, rather than a horizontal one perpendicular to the body. Foregrips can decrease accuracy in precision rifle shooting if the shooter tends to "muscle the weapon".
Angled forward grip
Angled forward grips can provide similar functionality to vertical forward grips. One such popular product is the MagPul Dynamics AFG, or Angled Fore Grip. This allows the operator to lay the palm of his or her hand onto the grip while pushing the thumb down on the top of the gun.
Stubby grip
A shorter version is referred to as a "Stubby grip", primarily intended to keep the shooter's hand from moving forward of the muzzle.
Legality on pistols in the United States
The legality of vertical foregrips on pistols in the United States is unclear. In the United States, firearms are categorized by the National Firearms Act and firearms manufactured with specific features are subject to restrictions and controls. 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.
