Geissele SMR Mk4 15″ Super Modular Rail M-LOK, Black

Description

The Geissele SMR Mk4 Super Modular Rail is a 15″ free-float M-LOK handguard designed for AR-platform rifles. Built from 6061-T6 aluminum with an anodized black finish, it balances a rigid mounting platform with extensive venting to reduce overall weight. The rail integrates short M1913 Picatinny sections and Magpul-compatible M-LOK slots at multiple positions to support a wide range of accessories. Geissele’s proprietary 2.25″ long barrel nut increases surface contact where the rail interfaces with the receiver to help maintain straightness and repeatable zero during disassembly and reassembly; installation requires a Geissele barrel nut wrench (sold separately).

Key Specifications

• The rail length is 15″.
• The material is 6061-T6 aluminum.
• The finish is Anodized.
• The color is Black.
• Intended firearm compatibility is AR-15 / AR-platform.
• The attachment system uses M-LOK slots and integrated short M1913 Picatinny rail sections.
• The product lists 3 positions (M-LOK) as an attribute and provides additional upper 45-degree quadrant slots.
• The rail includes integrated Picatinny sections for optic and accessory mounting forward on the handguard.
• The product type is a Railed Forend.
• Installation requires a Geissele barrel nut wrench (sold separately).

This Super Modular Rail Mk4 is aimed at builders and shooters who prioritize a lightweight, modular platform with secure mounting and repeatable alignment. Its combination of M-LOK flexibility, integrated Picatinny sections, and a long contact barrel nut provides a serviceable foundation for a wide range of AR-platform configurations and accessory setups.