Geissele Automatics Super Modular Rail MK4 15in M-LOK Free-Float Handguard, Black 05-315B

SKU: FLX-GEI05-315B

Regular price $352.98
Sale price $352.98 Regular price $375.00
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Product Description

The Geissele Super Modular Rail (SMR) MK4 M-LOK is an ultra-lightweight, free-float AR-15 handguard built to deliver a strong, rigid mounting platform with excellent heat management. Purpose-built with maximum venting for heat dissipation, the MK4 maintains durability while reducing overall weight. It features Magpul M-LOK attachment points at the 3, 6, and 9 o’clock positions as well as the upper 45° quadrants, plus integrated short M1913 Picatinny rail sections at the fore end in the 3, 6, and 9 o’clock positions for versatile accessory mounting.

The MK4 includes Geissele’s proprietary 2.25-inch long barrel nut, designed to increase surface contact at the receiver interface to help keep the rail straight and true across the full length. This design supports accuracy and zero repeatability during disassembly and reassembly for maintenance. Installation requires a Geissele barrel nut wrench (sold separately).

Product Highlights

  • Ultra-lightweight Super Modular Rail MK4 free-float design for AR-15 platforms
  • M-LOK slots at 3/6/9 o’clock and upper 45° quadrants for modular accessory placement
  • Integrated short M1913 Picatinny rail sections at the fore end (3/6/9 o’clock positions)
  • Maximum venting promotes heat dissipation while helping reduce overall rail weight
  • Includes Geissele proprietary 2.25-inch barrel nut for a straight, rigid interface (wrench sold separately)

Specs

  • Brand: Geissele Automatics
  • Product: Super Modular Rail (SMR) MK4 M-LOK Handguard
  • Color: Black
  • Length: 15 in
  • Height: 2.4 in
  • Inner Diameter: 1.35 in
  • Outer Diameter: 2.11 in
  • Weight (with hardware): 15.1 oz
  • Barrel Nut: Proprietary 2.25 in barrel nut (included)
  • Installation Note: Requires Geissele barrel nut wrench (sold separately)
  • UPC: 854014005731
  • Manufacturer Part Number: 05-315B

Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product’s manufacturer.

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