Geissele Automatics, MK4, Super Modular Rail, Handguard, 13.5", M-LOK

Geissele Automatics Super Modular Rail MK4 M-LOK 13.5" – Black

Now Available at BattleHawk Armory – Ultra-Lightweight, Dependable, and Versatile

The Geissele Automatics Super Modular Rail (SMR) MK4 is an ultra-lightweight M-LOK® handguard purpose-built to handle intense heat and extended firing sessions without compromising reliability. Featuring M-LOK slots at the 3, 6, 9, and upper 45-degree quadrants, this 13.5-inch rail allows for maximum heat dissipation, reduced weight, and extensive mounting versatility. Developed with Geissele’s proprietary 2.25" long barrel nut, the SMR MK4 ensures a solid interface for superior accuracy and consistent zero retention.

Key Features

• 13.5" Lightweight Handguard

  • Ideal for mid-length or rifle-length builds, balancing coverage and minimal added weight.

• Robust M-LOK Mounting

  • M-LOK at the 3, 6, 9, and upper 45-degree positions for customizable accessory placement.

  • Integrated short M1913 Picatinny rail sections at the fore in the 3, 6, 9 o’clock spots.

• Proprietary 2.25" Barrel Nut

  • Expanded contact area secures the rail firmly to the receiver.

  • Maintains a true, straight alignment even through multiple disassemblies and reassemblies.

• Maximum Heat Dissipation

  • Generous venting design ensures cooler operation during high-volume firing.

  • Maintains strength and rigidity while keeping weight low.

• High-Grade Construction

  • Precision-machined for optimal performance under demanding conditions.

  • Requires Geissele barrel nut wrench (sold separately) for installation.

Specifications

• Manufacturer: Geissele Automatics

• Model: MK4 Super Modular Rail

• Type: Free-Float M-LOK Handguard

• Length: 13.5"

• Height: 2.4"

• Inner Diameter: 1.35"

• Outer Diameter: 2.11"

• Weight (with Hardware): 13.5 oz

• Color: Black (Anodized Finish)

• Included: Barrel Nut (Barrel Nut Wrench Sold Separately)

• Gas Block: Not Included

• UPC: 854014005717

• MPN: 05-278B

Why Choose the Geissele SMR MK4?

• Ultra-Light & Rigid – Perfect for maximizing maneuverability without sacrificing stability.

• Enhanced Accessory Integration – M-LOK slots plus integrated Picatinny rails meet a variety of mission or range needs.

• Secured Accuracy – Extended barrel nut ensures consistently aligned free-float rail for improved shot placement.

• Trustworthy Design – Geissele Automatics is known for producing premium, duty-proven components.

Elevate your AR build with the Geissele Automatics Super Modular Rail MK4 M-LOK 13.5". Order now at BattleHawk Armory and experience top-tier reliability and performance.