Your Browser is OutdatedIs this actually considered a vertical foregrip since has a 100 degree angle? — 3 Answers
NOT A LAWYER, but I've done a lot of research on this issue for my personal benefit. The dictionary definition of "vertical" is at a right angle to a horizontal plane, in this case the horizontal plane in question is the barrel/bore of the firearm. Anything that is not a 90-degree angle is not "vertical." By this logic, this is not a vertical grip, it is an angled grip. HOWEVER... the fact that it is marketed as a "vertical foregrip" could still cause you a lot of heartache if you were to mount this particular item on a handgun. You may not be in violation of the law, but it could take a judge and jury to determine that, which is going to cost you much more than just buying a different item if your intended use is on a pistol.
For your information, Federal law currently does not define “Vertical Fore Grip”; however, ATF has determined that a grip of this type is distinguished by being both forward of the magazine well and oriented at a perpendicular (90-degree) angle to the bore of the weapon
I am no expert and cannot answer this definitively, but I would not consider this legally "safe" to use on a pistol without risking the possibility that the gun falls under the legal definition of an AOW under the NFA. As far as I am aware, the NFA and ATF do not mention any specific angle for the purposes of defining an AOW/rifle other than the inclusiom of the word "vertical." It could be argued in court that "vertical" does not mean 90 degrees specifically, and the fact that this item is marketed as a "vertical" foregrip and not marketed specifically as an "angled" foregrip would not help your case if charged with being in posession of an unregistered NFA item.