There is no such thing as an “illegal” grip on a gun. However, certain grips are illegal to possess in some states, depending on the type of firearm it is used on. A foregrip would generally be considered an illegal grip to possess on a rifle, but not on a handgun. Conversely, a thumbhole grip would be legal on a rifle but not a handgun. It is always best to check with your local laws before purchasing or using any type of gun grip.
Matthew Answered question August 6, 2022