MAGPUL M-LOK Cantilever Rail Polymer Picatinny Rail — Black

The MAGPUL M-LOK Cantilever Rail Polymer is a reinforced-polymer cantilever Picatinny rail designed for those who mount lights, optics, or other MIL-STD-1913 accessories on M-LOK handguards and need to gain longitudinal position relative to the attachment point. At 80 mm overall length with three full Picatinny slots, it provides positioning flexibility even on compact handguards.

The cantilever profile moves the Picatinny window from 19 to 38 mm forward of the M-LOK anchor slot, shifting the mounted accessory toward the muzzle without shortening the handguard or sacrificing grip. That trade-off is worth keeping in mind: the cantilever arm improves ergonomics and offers greater positioning freedom, but it introduces a bending moment that — under calibers with significant recoil — calls for periodic torque checks. For lights and laser aiming devices on small- to medium-calibre rifles, or in standard tactical use, the reinforced polymer is more than adequate; those who need maximum rigidity on bench rifles or heavy-recoil calibers will prefer an aluminium version.

The mounting hardware includes T-nuts with a cam and recoil-mitigation lugs that distribute load across the M-LOK slot and resist dynamic stress. Chamfered edges and corners reduce snag points during fast manipulation — a detail that matters in operational environments and dynamic shooting.

Key points

• Moves Picatinny accessories from 19 to 38 mm forward of the M-LOK attachment point, improving ergonomics without modifying the handguard.
• Three full MIL-STD-1913 slots across 80 mm allow optimal placement of lights, aiming devices, and compact optics.
• Reinforced polymer with chamfered edges adds no unnecessary weight and reduces unwanted snags during fast manipulation.
• Cam T-nut mounting kit with recoil-mitigation lugs provides a stable hold without requiring special tools for installation on any M-LOK surface.
• Low-profile design and uniform black finish integrate cleanly without altering the weapon's lines.

In the box

• M-LOK Cantilever Rail Polymer
• Mounting screws
• Cam T-nuts with recoil-mitigation lugs