Brand: Kinetic Development Group
Model: MREX20 AXL
Firearm Fit: FN SCAR 20S (7.62x51mm and 6.5 Creedmoor)
Top Rail: M-LOK Step-Down; lowers the 12 o’clock profile forward of the receiver to provide clearance for top-mounted lasers and optics
Attachment Style: Modular receiver/chassis upgrade; replaces the factory side and bottom Picatinny rails
Attachment Positions: M-LOK slots at 2, 3, 6, 9, and 10 o'clock; features a full-length integrated Arca-Swiss (RRS-Lock) rail along the 6 o'clock surface
Material: Machined 6061-T6 Aircraft-Grade Aluminum
Finish: Non-Infrared Reflective (NIR) Cerakote (FDE)
Length: 16.125 inches (overall); extends 3.5 inches further than the standard MREX20
Weight: 9.5 oz (rail only)
Inside Diameter: Optimized for the heavy-profile SCAR 20S barrel
Outside Diameter: Slim, ergonomic profile with a flat base for tripod and barricade stability
Includes: MREX20 AXL rail, two mounting bridges (standard and forward), full hardware kit (M5-0.8 fasteners), T25 Torx wrench, and thread-locking compound

Features

The KDG FN SCAR 20S Rail – MREX20 AXL is the most advanced configuration in KDG’s MREX MkII lineup, combining extended rail length with an integrated precision mounting system for the FN SCAR 20S platform. Built for serious long-range shooters, this variant delivers maximum modularity, rigidity, and stability for precision applications. Constructed from 6061-T6 aircraft-grade aluminum with a non-reflective, NIR-compliant Cerakote finish, the rail is engineered for durability while maintaining a lightweight profile. Its extended XL design adds approximately 3.5 inches of forward length and additional M-LOK slots, providing expanded space for bipods, lasers, and other accessories. What sets the AXL variant apart is the integration of a full-length Arca Swiss rail system paired with Really Right Stuff’s RRS-Lock interface, allowing direct tripod mounting without sacrificing M-LOK compatibility. This makes it ideal for precision shooting, competition, and supported firing positions. Engineered with a reinforced dual-bridge chassis, flat-bottom profile, and streamlined ergonomics, the MREX20 AXL provides a rock-solid platform that enhances accuracy, recoil management, and consistency at extended distances. Designed specifically for FN SCAR 20S rifles, the MRX5-A-160 (FDE configuration) is a top-tier upgrade for shooters looking to maximize long-range performance and system adaptability.

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