The Super Modular Rail MK4 M-LOK from Geissele is an ultra-lightweight option for full-size AR builds. At 15 inches in length, these rails are purpose-built and feature integrarted Picatinny rail sections at the front of the rail in the 3, 6, and 9 o’clock positions. The free-floating design also lends itself to efficient barrel venting, ensuring heat can dissipate swiftly after you fire. The MK4 Super Modular Rail also has M-LOK connections along the rails and in the upper 45 quadrants so that you can mount a variety of accessories to customize your weapon to your exact needs. The modular nature and versatility of the MK4 is what makes it stand out from the crowd, giving you options for tactical, functional, and sport shooting upgrades. The Super Modular Rail MK4 also features the Geissele’s proprietary 2.25-inch long barrel nut, which is larger and stronger than other varieties. The extra length increases the nut’s surface contact where the rail interfaces with the receiver, creating a platform that is straight and true. With the extra rigidity, you can maintain your accuracy and zero-in your optics reliably. Specifications for Geissele 15in Super Modular Rail MK4 M-LOK: Manufacturer: Geissele Finish: Type III Hardcoat Anodized Gun Type: Rifle Handguard Length: 15 in Handguard Type: Free-Float Gun Rail: Picatinny Weight: 12.8 oz Condition: New Included Accessories: Standard Inner Diameter: 1.35 in Outer Diameter: 2.11 in Height: 2.4 in Mount Type: M-LOK Country of Origin: USA Quantity: 1 Features of Geissele 15 inch Super Modular Rail MK4: Picatinny Rails M-LOK Connections 2.25-inch Barrel Nut Free-floating Handguard Anodized Finish Package Contents: Geissele 15in M-LOK Super Modular Rail MK4 NOTE: IF THIS IS YOUR FIRST TIME PURCHASING A GEISSELE AUTOMATICS RAIL, YOU WILL NEED TO PURCHASE A BARREL NUT WRENCH IN ORDER TO PROPERLY INSTALL THE RAIL.
6 reviews for Geissele 15in Super Modular Rail MK4 M-LOK
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MattP –
Let's get this out of the way first: Yes, it's expensive. However, for the price you are also getting a very nice low-pro gas block, so if you can manage a coupon and then back out the cost of the GB, you're closer to $200 than $300, and that's easier to stomach. But you get what you pay for.This rail is SOLID. Installation is a breeze and the machining tolerances are super tight. It took me maybe 20 minutes to get it all together and the end result is awesome. I particularly like the rail sections at the muzzle end of the MK4 given that the only thing I would ever install is a bipod adapter and maybe a light.I bought this for an SPR build and I have to tell you, it looks SHARP. I am a gear snob and have a LaRue rail on one of my guns, along with some Troy and YHM. I guess you could say that a free-float rail is a free-float rail, but the Geissele really stands out as a quality piece of kit. You will not be disappointed.
Niko –
This is an absolutely beautiful piece of machinery. Quality on every inch of this Geissele artwork. It is very easy to install (only about 15 minutes). The fit of the handguard over the barrel nut is immaculate.
Napalmjerry –
The fit and finish is top notch. The rail is nice and wide so those of you with large hands will love this. The only thing I can complain about is the variation of color between individual rails, but they are very upfront about this so I can’t fault them too much.
ASK –
Awesome. Beautiful. Love the color. Fits more secure than any rail.Super as are all Geissle products. Easy, secure install!!!!!!!!Con ………… PRICE but you get what you pay for. Only comparable is Faxon carbon fiber, also expensive!!!
Jake –
After looking at a lot of rails for both my 300 blackout and 556 build i decided on this rail do to the fact that i can retain correct barrel nut torque without having to take the rail off and on and the barrel nut off and on to get the rails to match up. The geissele rail slips over the round barrel nut very nicely. Very nice machining went into the rail and nut and the tolaraces are amazing. The install took 15-20 minutes at a nice pace and once mounted and the bolts tightened down was rock solid. The rail also came with a low profile steel gas block. Again very nice quality, fit, and finish. This rail nice for people building an upper because other then the gas tube you are all set to go and that is two less things you need to buy for the build.
Jdel –
It took a min but i finally got it and its in excellent condition, this rail was out if stock everywhere else