Kinetic Development Group
Longest MREX MkII rail for the FN SCAR 16/17, with a 13.34-inch overall length and maximum forward M-LOK space.

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Kinetic Development Group 6.5" SCAR MREX M-Lok MKII Handguard, Black - MRX5-MK2-020
The factory FN SCAR forend gives you very little to work with: a short top rail and minimal M-LOK real estate, which leaves no good home for a light, laser, bipod, or hand stop where you actually want them. The Kinetic Development Group MREX MkII fixes that. It is an extended M-LOK rail system that replaces the stubby factory section and runs M-LOK slots along the 3, 6, and 9 o'clock positions, giving the SCAR 16 and SCAR 17 the forward mounting length the platform should have shipped with.
This catalog record is the longest 6.5-inch model, not the whole MREX family. It measures 13.34 inches overall and weighs 8.5 ounces plus 2.5 ounces of mounting hardware. The black SKU is MRX5-MK2-020; FDE sibling MRX5-MK2-120 is selected on the same page. KDG sells the 4.25- and 2.2-inch rails on separate pages, so each now has its own catalog identity and route instead of hiding behind one ambiguous family record.
Add the KDG SCAR MREX MkII 6.5 M-LOK Rail to your build and see how it enhances your platform.