MREX20 AXL – Black

SKU: MRX5-A-060Categories: FN SCAR Accessories, MREX MK2, MREX20

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The MREX20 is the first modular receiver / chassis system of its kind designed solely for the FN Scar 20s. Built with the legendary durability of the MREX MkII and crafted with design notes taken from the mountain tops of New Hampshire, observing over 100 years of collective sniper and long-range experiences. Since its introduction in 2016, the MREX family has established itself as a top choice for SCAR 16s and 17s shooter, and now with the MREX20, long-range marksman can benefit from the same level of performance and reliability. Whether you’re looking to improve accuracy, ergonomics, or overall functionality, the MREX20 is designed to meet your needs and exceed your expectations. 

The MREX20 features a sleek and durable design, with a Non-Infrared Reflective Cerakote coating to reduce visibility. Utilizing industry standard MLOK technology, this rail keeps weight down and eliminates sharp edges while still allowing for the attachment of accessories. The ergonomic flat base allows for easy engagement from various positions, such as shooting from a bag or barricade. The addition of a second bridge enhances the overall strength and stability, giving the rifle a complete chassis upgrade feel rather than just a receiver extension or bolt-on rail. This design offers improved performance and versatility in your shooting experience.


The MREX20 comes in 4 models to suit a variety of needs:

  1. MREX20 – Baseline option: This model has no added nomenclature or additional features not already described.
  2. MREX20 XL – Extra Length: This model offers 2 additional MLOK slots forward of the receiver, extending the overall length of the chassis by 3.5 inches. The step-down design of the extension sits lower than the monolithic picatinny rail on the upper receiver, providing optical clearance for lasers and other accessories. 
  3. MREX20 A – Arca: This model features an integrated Acra track along the bottom side of the rail without compromising any MLOK mounting options. This model also includes Really Right Stuff’s RRS-Lock to reduce weight and prevent unintentional repositioning when used in conjunction with a tripod, complementing the traditional friction-based clamping.
  4. MREX20 AXL- Arca Extra Length: This model combines all the features of integrated Arca, MLOK, and RRS-Lock with the added 3.5 inches of length and forward MLOK mounting. 

Inside the Box: 

  • 1 – MREX20 
  • 3 – M5-0.8x12mm fasteners 
  • 2 – M5-0.8x8mm fasteners
  • 2- Custom centering fasteners
  • 2- Bridges
  • 1 – T25 Torx wrench 
  • Vibra-tite or equivalent


  • NIR Cerakote
  • 6061 T6 Aircraft Aluminum 
  • More to come…

Vehicle Prepping & EDC – Part 1.

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