Introducing the new Hook-Stop by Aeroknox. Precision machined out of billet 6061 aluminum, this stop was specifically designed with the shooter in mind. Knowing that no two shooters are the same, and each has his or her own grip preference. Use it as a stop, use it to hook your finger through and pull towards your shoulder, or stack two fingers in the front to accomplish the same pulling action. This stop helps provide a grip that best suits you, and keeps you in the most comfortable, solid shooting position. Lightweight, durable, elegant. Available for M-LOK or Keymod.