The Saber Tactical Rail Weights are designed for use with "M-LOK" compatible handrails. These weights attach to the rail using the M-LOK system, allowing for a secure and seamless addition of weight to the handrail. This can help to balance the rifle and reduce felt recoil. They can also be used to add a tactical look to the rifle. These M-LOK rail weights are a great choice for anyone looking to add weight and improve the balance of their rifle while still maintaining the ability to easily add or remove accessories.