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The FN SCAR is a great rifle out of the box, but the factory handguard leaves a lot of real estate on the table. The Kinetic Development Group MREX MKII 6.5" solves that. It's a modular receiver extension that replaces the stock forend and gives you M-LOK mounting slots running the full length of the rail, plus a longer top platform so your optics, lights, and back-up sights all have room to breathe. This version extends 6.5 inches beyond the SCAR upper receiver, which makes it the go-to length for full-size builds and longer barrels.
KDG built the original MREX years ago and it earned a real reputation with both civilian owners and special operations units. The MKII is the refined version, shaped by feedback from those users. The biggest change is that the old full-length Picatinny top rail is gone, replaced with M-LOK slots for far more flexible accessory placement. They also added slots at the 2 and 10 o'clock positions, which double as mounting points and help shield your hand from gas block heat. The result is a rail you can truly configure your way instead of working around a fixed layout.
The handguard is precision-machined from 6061-T6 aircraft-grade aluminum and finished in Flat Dark Earth Cerakote chosen to match Magpul FDE gear. Overall length runs 13.34 inches and it tips the scale around 8.5 ounces, so you're adding reach and mounting space without any meaningful weight penalty. It holds zero for electronic optics mounted up top, and once it's on the barrel assembly it can stay put through configuration changes.
This rail fits both the FN SCAR 16S and 17S platforms. The MKII was designed to install with less hardware than the original, which streamlines the job, though this is still a project that rewards basic gunsmithing experience or a trip to someone who's done it before. It ships with a hardware kit and two M-LOK Picatinny rail sections so you can bolt on gear right away.
Yes, this 6.5" MREX MKII is designed to fit both the FN SCAR 16S and 17S platforms. The 6.5-inch length is the full-size option, so it pairs especially well with longer barrels and standard-length builds. If you're running a shorter barrel or an SBR, KDG also makes the MKII in 4.25" and 2.2" lengths.
No, and that's actually the point of the update. The MKII replaces the old full-length Picatinny top rail with M-LOK slots, which opens up far more flexible accessory placement. It ships with two M-LOK Picatinny rail sections, so you can add a Pic surface exactly where you want one instead of carrying a full rail everywhere.
The MKII was designed to go on with less hardware than the original MREX, which makes the job cleaner. That said, it's still a project that rewards some basic gunsmithing know-how, so read through KDG's installation instructions first. Once it's mounted on the barrel assembly, it can stay attached through configuration changes.
Not really. It's machined from 6061-T6 aluminum and comes in around 8.5 ounces, so you gain reach and mounting space with essentially no meaningful weight penalty. Owners consistently note that the extra length and hand position are more noticeable than any added heft.
| UPC | 851064007739 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MRX5-MK2-120 |
| Color | Flat Dark Earth |
| Length | 6.5 |
| Model | |
| Product Type | Handguard |
| Style | M-LOK |
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