The Super Modular Rail (SMR) MK8 M-LOK is a lightweight, versatile, and modular rail system that utilizes Magpul's M-LOK technology. The SMR MK8 features maximum venting at the lower 45 degree quadrants for maximum heat dissipation and weight reduction. It also features Geissele's proprietary 2.25 inches long barrel nut for increased accuracy and zero repeatability. The SMR MK8 M-LOK is a high quality rail system that is perfect for a variety of applications. It is lightweight, versatile, modular, and accurate, making it a great choice for shooters who want a rail that can be customized to their individual needs.