Geissele 9.3" MK4 Super Modular Rail M-LOK - Black

The Mk4 rail is the staple of Picatinny and M-LOK rails

Enhance the performance and versatility of your AR-15 rifle with the Geissele 9.3" MK4 Super Modular Rail M-LOK in sleek black. Built with durability and precision in mind, this rail system offers a range of features that make it a top choice for firearm enthusiasts. With integrated Picatinny rail sections, maximum heat dissipation, and the flexibility of Magpul's M-LOK technology, the Geissele SMR MK4 empowers you to customize your firearm to suit your unique needs.  Geissele's Mk4 rail is one of the first designs to incorporate M-LOK and Picatinny in a free-floating rail.  This is clearly a good choice for the shooter with accessories like a flashlight or nigh vision illumination.  Don't be shy of being traditional with the Mk4 rail.

The Geissele SMR MK4 is purpose-built with an ultra-rugged construction, ensuring it can withstand the demands of intense shooting sessions. The integrated M1913 Picatinny rail sections at the 3, 6, and 9 o'clock positions allow for easy attachment of accessories such as optics, grips, and lights. Additionally, the upper 45 quadrants feature Magpul's M-LOK technology, offering even more modularity for your accessories.  The rail also provides for a QD slot near the connection point with the upper receiver.

Geissele's 9.3" design provides uncompromising accuracy and stability for the short-barreled upper.  Geissele's proprietary 2.25" long barrel nut design has been a staple at Geissele, and copied by other brands, because it works. By increasing the surface contact between the rail and the receiver, this rail system ensures a straight and true platform, enhancing accuracy and zero repeatability. Whether you're performing maintenance or disassembling and reassembling your rifle, you can trust that the Geissele SMR MK4 will maintain its integrity.

The Mk4 rail is lightweight and durable design, with strong structural aluminum alloy for stability.  Crafted from high-quality 7000 series aluminum, the Geissele SMR MK4 achieves a balance of strength and weight reduction. The rail's maximum venting design not only promotes effective heat dissipation, but it also significantly reduces overall weight. With a Type 3 Hardcoat Anodize finish, this rail system is resistant to wear, corrosion, and abrasion, ensuring long-lasting performance.

FAQ's

• Is the Geissele 9.3" MK4 Super Modular Rail compatible with billet receiver sets?

  • Geissele rails are specifically designed to work with Mil-Spec M4 upper receivers. At this time, compatibility with billet receiver sets is unknown. Charlie's recommends consulting with the manufacturer of your billet receiver set for further information.

• What is the inner diameter of the Geissele 9.3" MK4 Super Modular Rail?

  • The inner diameter of the Geissele 9.3" MK4 Super Modular Rail is 1.35 inches. This provides ample space for a low profile gas block, but not enough space for most rifle suppressors.

• Can I install this rail system myself?

• Yes, the Geissele 9.3" MK4 Rail can be installed by individuals with basic knowledge of AR-15 assembly and a few common tools. However, if you are unsure or uncomfortable with the installation process, we recommend seeking assistance from a qualified armorer.

• Does the Geissele 9.3" MK4 Super Modular Rail come with a barrel nut, or is this rail compatible with a mil-spec barrel nut?

  • The Mk4 rail is not compatible with a mil spec barrel nut, but Geissele includes a 2.25" long barrel nut. This ensures a secure and precise fit, increasing accuracy and zero repeatability during disassembly and reassembly.

• Can I use this rail with a carbine-length gas system?

  • Yes, the Geissele 9.3" MK4 Super Modular Rail is compatible with carbine-length gas systems. It provides ample clearance for the gas block and allows for proper functioning of your firearm.

• Can I attach accessories to the rail using M-LOK slots?

  • Absolutely! The Geissele 9.3" MK4 Super Modular Rail features Magpul's M-LOK technology at the 3, 6, and 9 o'clock positions, as well as the upper 45 quadrants. This allows for easy attachment of M-LOK compatible accessories, providing you with a wide range of customization options.

• What is the weight of the Geissele 9.3" MK4 Super Modular Rail?

  • The Geissele 9.3" MK4 Super Modular Rail weighs 9.3 ounces without the barrel nut and 11.2 ounces with the barrel nut. Its lightweight design helps to minimize overall weight while maintaining durability and rigidity.

• Can I choose a different color for the Geissele 9.3" MK4 Super Modular Rail?

  • Currently, the Geissele 9.3" MK4 Super Modular Rail is available in Black, DDC and OD Green.  This option on this page is for black.  Charlie's offers the other colors separately.

• What barrel lengths work best with the 9.3" MK4 Rail?

  • The Geissele MK4 Super Modular Rail is available in four lengths: 9.3", 10.5", 13.5", and 15". This allows you to select the ideal length that suits your specific shooting needs and preferences.  This product offering is for the shortest rail length, the 9.3"  This means that shorter barrels, like 10.3", 10.5", 11.5" and 12.5" will all work well with this rail.  Longer barrels will most likely work better with longer rails, but that is up to you.

We hope this information addresses your queries. If you have any more questions, please feel free to ask!

Specifications