Geissele Super Modular MK4 M-LOK AR-15 Handguard
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π Shipping & Delivery
π Shipping & Delivery
Most in-stock orders are typically processed within 1β2 business days before carrier handoff. Processing time is separate from carrier transit time.
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π Returns, Exchanges & Warranty
π Returns, Exchanges & Warranty
Eligible non-custom returns must be requested within 30 days of delivery. Items must be unused, uninstalled, unmodified, and in their original, undamaged packaging.
Eligible standard returns may be subject to a 15% restocking fee. EU withdrawal returns are handled under applicable statutory rights; prohibited restocking fees do not apply, though lawful diminished-value deductions may.
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Warranty Coverage: Manufacturer warranties apply to all standard products. Any defects, malfunctions, or performance issues are handled directly by the manufacturer per their terms.
HR Tactical Innovations covers a Fitment & Functionality Guarantee on all custom or modified items β if a verified production error occurs, weβll replace the item.
View our Refund Policy for full details.
π International Shipping
π International Shipping
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ποΈ Military / GovX Discounts
ποΈ Military / GovX Discounts
βοΈ Product Details
βοΈ Product Details
The Geissele Super Modular MK4 Rail is an ultra-light, precision-machined free float handguard built specifically for the AR-15 platform. Designed for rigidity, repeatable zero retention, and modular flexibility, the MK4 delivers professional-grade performance without excess weight.
Machined from 7000 Series aluminum and finished in Type III hardcoat anodizing, this rail is built to handle serious use while maintaining a refined, streamlined profile.
Precision Free Float Design
Proprietary Barrel Nut System
The included barrel nut increases surface contact between the rail and upper receiver, enhancing rigidity and improving accuracy and repeatability if the handguard is removed for maintenance.
True Free Float Platform
Eliminates pressure on the barrel, allowing consistent harmonics and improved accuracy potential.
Advanced Mounting System
M-LOK on Five Surfaces
Accessory slots run along five sides of the rail, allowing flexible placement for lights, grips, bipods, and mission-specific equipment while promoting airflow for cooling.
Full-Length M1913 Picatinny Top Rail
Continuous top rail supports optics, backup irons, and night vision devices.
Integrated Front Rail Sections
M1913 sections at the 3, 6, and 9 oβclock positions near the muzzle allow solid mounting of weapon lights and bipods.
Lightweight Strength
7000 Series Aluminum Construction
Engineered for durability while keeping weight minimal.
Type III Hardcoat Anodized Finish
Available in Black and Desert Dirt Color (DDC) for corrosion resistance and long-term durability.
9.3" Model Weight
11.0 oz (weight varies slightly by length).
Available Configurations
Black
9.3"
10"
13.5"
15"
Desert Dirt Color (DDC)
9.3"
13.5"
15"
Ideal For
Duty rifle builds
Competition AR setups
Precision-focused builds
Modular tactical platforms
Specifications
Specifications
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Material
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Color / Finish
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Included Components
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Platform CompatibilityMil-Spec AR
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Mounting InterfaceM-LOK, Picatinny / 1913
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Weight
Reviews & Questions (1)
Reviews & Questions (1)
Payment & Security
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