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Geissele Automatics Super Modular Rail MK4 Free-Float M-LOK Handguard 13.5in Black 05-278B

SKU: FLX-GEI05-278B

Regular price $331.98
Sale price $331.98 Regular price $350.00
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Product Description

The Geissele Automatics Super Modular Rail (SMR) MK4 M-LOK is an ultra-lightweight, free-float AR-15 handguard built for strength, rigidity, and modular accessory placement. Designed around Magpul M-LOK slots at the 3, 6, and 9 oclock positions (plus the upper 45-degree quadrants), it allows you to configure lights, grips, and other accessories exactly where you need them. Integrated short M1913 Picatinny rail sections at the fore end (3/6/9 oclock) add additional mounting flexibility, while extensive venting promotes heat dissipation without sacrificing the rails robust feel.

The MK4 uses Geisseles proprietary 2.25-inch long barrel nut to increase surface contact with the receiver for a straight, true interface that supports accuracy and repeatable zero after maintenance. Installation requires a Geissele barrel nut wrench (sold separately). Finished in black and built to demanding standards, the SMR MK4 is a versatile choice for hard-use AR builds.

Product Highlights

  • Free-float Super Modular Rail (MK4) design enhances rigidity and supports consistent accuracy and repeatable zero
  • M-LOK accessory mounting at 3, 6, and 9 oclock plus upper 45-degree quadrants for highly modular setups
  • Integrated short M1913 Picatinny rail sections at the fore (3/6/9 oclock) for secure accessory mounting
  • Maximum venting helps dissipate heat while keeping overall weight low
  • Includes Geissele proprietary 2.25-inch long barrel nut (barrel nut wrench sold separately)

Specs

  • Brand: Geissele Automatics
  • Model/Series: Super Modular Rail (SMR) MK4
  • Mount Type: M-LOK
  • Handguard Type: Free-Float
  • Length: 13.5 in
  • Integrated Rail Sections: Short M1913 Picatinny sections at fore in 3/6/9 oclock positions
  • Height: 2.4 in
  • Inner Diameter: 1.35 in
  • Outer Diameter: 2.11 in
  • Weight (with hardware): 13.5 oz
  • Material: 6061-T6 Aluminum
  • Finish: Type III Hardcoat Anodized (Black)
  • Included: Barrel nut (barrel nut wrench sold separately)
  • Compatible Platform: AR-15 (Mil-Spec M4 upper receivers)
  • Country of Origin: USA
  • UPC: 854014005717
  • Manufacturer Part Number: 05-278B

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