Topic summary
Foregrip

Extracted from the Wikipedia article Vertical forward grip.
Angled forward grip
Angled forward grips can provide similar functionality to vertical forward grips. They differ in that a vertical foregrip is more useful for "driving" the weapon, while an angled foregrip is more effective at pulling the weapon into the shooter's shoulder while keeping the offhand wrist in a comfortable and manageable position, which helps with accuracy. Some angled foregrips are designed to be used with the C Clamp grip which allows good pointability (as vertical foregrips allow) as well as better accuracy because of the shooter's more firm purchase on the weapon.