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The Geissele MK16 Super Modular Rail is one of those parts that earns its reputation the moment you get it in hand. This 15-inch M-LOK handguard is built for AR-15 uppers and gives you full-length coverage from the receiver all the way out toward the muzzle, which is exactly what you want if you're running a mid-length or full-length gas setup and like to spread your gear out. It's precision machined from 7000 series aluminum, so it comes in stiff and light, then finished in Type-3 hardcoat anodize to shrug off the wear that comes with real use.
The heart of this rail is the Geissele barrel nut. It's a proven, updated design that clamps the handguard down with anti-rotation tabs and set screws, so the rail stays put and holds zero even when you're leaning on it hard. That lockup is a big part of why the MK16 platform got picked up by USASOC for the URG-I program. You're getting the same core engineering that goes onto duty rifles, just in a version you can bolt onto your own build.
Up top you've got a continuous M1913 Picatinny rail at 12 o'clock, which gives optics, magnifiers, night vision, and backup irons a solid, uninterrupted mounting surface. Every other quadrant is loaded with M-LOK slots, so lights, lasers, hand stops, bipods, and pressure switches all find a home right where you want them. The profile is comfortable to grip and slim enough to run a support hand forward without feeling clubby.
Folks who have put this rail through its paces tend to point out the same things: the fit is tight, the build feels overbuilt in the best way, and install is straightforward. Keep in mind Geissele rails use a proprietary barrel nut, so you'll want their barrel nut wrench on the bench before you start. Torque the nut to spec, snug up the set screws, and you've got a rail that'll outlast most of the parts around it.
No. Geissele rails use a proprietary barrel nut, and the wrench is sold separately. If this is your first Geissele rail, plan on picking up the Geissele barrel nut wrench so you can torque everything to spec during install.
It's designed to work with standard Mil-Spec M4 upper receivers, which covers the vast majority of AR-15 builds. Geissele notes that compatibility with billet receiver sets is unknown, so if you're running a billet upper it's worth double-checking dimensions first. The 15-inch length pairs well with mid-length and full-length gas systems where you want maximum rail coverage.
The full-length M1913 Picatinny top rail handles optics, magnifiers, backup irons, and night vision devices along the entire 12 o'clock line. Every other quadrant has M-LOK slots, so you can add lights, lasers, hand stops, bipods, and pressure switch mounts wherever they work best for your setup.
The MK16 Super Modular Rail platform was adopted by USASOC for the URG-I (Upper Receiver Group Improved) program, with the 13.5-inch version being the issued length. This 15-inch model shares the same barrel nut lockup and 7000 series construction, so you're getting the same core engineering in a longer configuration.
| UPC | 817953028322 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 05-792B |
| Color | Black |
| Length | 15 |
| Model | |
| Product Type | Handguard |
| Style | M-LOK |
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