The Super Modular Rail (SMR) MK4 M-LOK are purpose-built and feature integrated M1913 picatinny rail sections at the fore of the rail in the 3, 6 and 9 o’clock positions. It also features Geissele’s proprietary 2″ long barrel nut.
Geissele Automatics 05-283B Super MK4 M-Lok Rail AR15 Rifle Aluminum
Geissele Automatics 05-283B Super MK4 M-Lok Rail AR15 Rifle Aluminum Black 9.5″
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Product Type | Railed Forend |
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Model | Super Modular Rail |

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