The Geissele MK4 Super Modular Rail (SMR) is engineered for rugged durability and modularity, making it a reliable choice for firearm enthusiasts seeking versatility. Designed with M-LOK compatibility, the rail features integrated M1913 Picatinny sections at the 3, 6, and 9 o’clock positions for mounting accessories like lights, lasers, or grips. Its lightweight yet strong design incorporates maximum venting to optimize heat dissipation, ensuring dependable performance during extended use.
Built for precision, the SMR MK4 employs Geissele's proprietary 2.25" barrel nut, increasing contact with the receiver for enhanced stability. This configuration ensures a consistent, true alignment, maintaining accuracy and repeatability even after disassembly for maintenance. The rail’s 7000 Series Aluminum construction, coupled with a Type 3 Hardcoat Anodize finish in Desert Dirt Color (DDC), provides exceptional durability in demanding conditions.
With a 9.3" length and an inner diameter of 1.35", the MK4 rail balances compact size and compatibility with modern accessories. Its compatibility with Mil-Spec M4 upper receivers ensures easy integration into existing setups, though fitment with billet receivers is uncertain.
| Attribute | Detail |
|---|---|
| Material | 7000 Series Aluminum |
| Finish | Type 3 Hardcoat Anodize |
| Color | Desert Dirt Color (DDC) |
| Length | 9.3 inches |
| Inner Diameter | 1.35 inches |
| Weight (w/ barrel nut) | 11.2 oz |
| Compatibility | Mil-Spec M4 Upper Receivers |
| Barrel Nut Length | 2.25 inches |
| Mounting Interface | M-LOK & M1913 Picatinny |
| MPN | 05-283S |
This rail offers a dependable platform for shooters seeking a lightweight, modular solution for their AR-15 or similar setups.
