M-LOK is a modular attachment system developed by Magpul Industries for firearms, particularly rifles. It allows users to easily attach accessories like grips, lights, and bipods to the handguard of their weapon. The system uses a series of slots and holes, providing flexibility in positioning and customization. The M-LOK system is designed to be lightweight and low-profile, minimizing added bulk to the firearm. It is compatible with various accessories from different manufacturers, making it a popular choice among firearm enthusiasts and professionals. This versatility enhances the overall functionality and adaptability of the weapon.