The Magpul M-LOK Polymer Rail Section (part no. MAG591-BLK) bolts onto any M-LOK-compatible handguard or forend and gives you a 7-slot run of 1913 Picatinny rail for mounting a light, laser, or vertical grip. Magpul Industries injection molds it from a proprietary reinforced composite for strength without adding the weight of an all-aluminum rail, and beveled ends keep it from snagging on gear or biting into your support hand. Every piece of hardware needed for a direct-to-M-LOK-slot install is included, so there’s nothing extra to source.

Key Specifications

• Adds a 7-slot section of 1913 Picatinny rail.
• Mounts directly to any M-LOK-compatible handguard or forend.
• Injection molded from a reinforced composite for enhanced strength and durability.
• Built lightweight compared to an all-metal rail section.
• Features beveled ends that reduce snagging and eliminate sharp corners.
• Includes all mounting hardware needed for installation.
• Works on both aluminum and polymer M-LOK handguards.
• Measures about 3.3 inches long.
• Finished in black.

Frequently Asked Questions

What handguards does this rail fit? Any M-LOK-compatible handguard or forend, aluminum or polymer.

Is mounting hardware included? Yes, everything needed to attach it directly to M-LOK slots is included.

How many Picatinny slots does it add? Seven slots of 1913 Picatinny rail.

Buy the Magpul M-LOK Polymer Rail Section, 7 Slots

An M-LOK handguard alone won’t mount a Picatinny-spec light or grip, and this Magpul rail section solves that with a lightweight, direct-fit piece exactly where you need it. Order it from our Lubbock, Texas gun shop and it ships fast to your door, along with more gun accessories and parts.