The Geissele Super Modular Rail (SMR) MK4 M-LOK is an ultra-lightweight, free-float handguard designed for AR-15 platforms. It combines extensive M-LOK attachment points with integrated short M1913 Picatinny sections at the fore for flexible accessory placement. Geissele’s design emphasizes heat dissipation and a rigid mounting interface through an extended barrel nut to improve zero repeatability.
Key Specifications
- The finish is Black.
- The material is Aluminum.
- Designed for the AR-15 platform.
- Features integrated M1913 Picatinny rail sections at the fore in the 3, 6, and 9 o’clock positions.
- Utilizes M-LOK attachment slots at the 3, 6, and 9 o’clock positions and upper 45-degree quadrants.
- The product type is a Railed Forend.
- Model designation is Super Modular (SMR) MK4.
- The style is M-LOK.
- Includes Geissele’s proprietary 2.25″ long barrel nut to increase surface contact where the rail interfaces with the receiver.
- Maximum venting reduces weight while maintaining a rigid, straight platform for repeatable zero during disassembly and reassembly.
Built for shooters and builders who prioritize a lightweight, modular mounting solution with proven mechanical integrity, the SMR MK4 balances low mass, efficient cooling, and flexible accessory placement. Its rigid interface and integrated rail sections make it a practical choice for precision-oriented AR-15 builds and demanding range setups.
