AR-15 M4 Quadrail Handguard

Drop-In Quad Rail

The NcStar MAR4S replaces the factory plastic handguards on a carbine-length AR-15 or M4 with a four-sided rail system. Each face carries a Picatinny rail, the slotted mounting standard most optics, grips, lights and lasers already clamp to, so you can run your accessories where you want them and index them back to the same spot. It installs in place of the standard handguards without a gunsmith, using your existing delta ring and front cap.

Features

• Four Picatinny Rails — A rail runs along the top, bottom and both sides, the slotted standard that most lights, lasers, grips and sights mount to directly.
• Carbine-Length Fit — Sized for the standard carbine gas system on AR-15 and M4 rifles, the most common setup on these guns.
• Drop-In Installation — Mounts in two halves against the factory delta ring and front cap, so no permanent fitting or barrel removal is needed.
• Numbered Slots — The rail slots are laser-marked with numbers so you can record an accessory's position and return it to the exact same spot.
• Vented Side Cutouts — Large elongated openings down each side shed heat from the barrel and cut weight off the assembly.
• Aluminum Construction — Machined from aluminum with a matte black anodized finish that resists scratching and corrosion.
• Continuous Top Rail — The top rail lines up with a flat-top upper receiver to give you one unbroken surface for optics and backup sights.
• Accessory-Ready Faces — All four sides accept MIL-STD rail accessories, so you are not limited to one side for mounting.

Fit And Build

The handguard is built from anodized aluminum in matte black and splits into upper and lower halves that clamp around the barrel. It is cut for carbine-length rifles, so check that your rifle runs a carbine gas system before ordering. Because it clamps to the standard delta ring, the top rail is not free-floating and sits flush with a flat-top upper for a continuous sighting plane.