As an expert in firearms and ammunition, I can tell you that the M-LOK (Modular Lightweight Rail) slots are a type of accessory mounting system developed by Magpul. M-LOK is a newer system compared to the traditional Picatinny rail and is designed to be lighter and more streamlined. The system uses a series of slots that are cut into the polymer or aluminum of a firearm's handguard or other components. These slots allow for the direct attachment of various accessories without the need for additional mounting rails.

Accessories designed for M-LOK slots typically have a bar or key that aligns with the slots and is secured with screws. This allows for a more solid and secure attachment compared to the sometimes less rigid Picatinny rail system. M-LOK has gained popularity among firearm enthusiasts for its ease of use, modularity, and the ability to maintain a low profile on the firearm.

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M-Lok is a free licensed accessory mounting system developed by Magpul Industries that allows for direct attachment to negative space mounting points. It is a competing standard to Keymod in regards of replacing the MIL-STD-1913 picatinny rail in some applications.read more >>