Geissele Automatics MK4 10.5" M-LOK Super Modular Rail Black
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Geissele
Overview
The Geissele Automatics MK4 10.5" M-Lok Super Modular Rail in black is a lightweight aluminum handguard designed specifically for AR-15 platforms. With a 5-inch handguard length and M-LOK mounting interface, it allows for versatile accessory attachment while maintaining a slim profile for improved maneuverability. This handguard is frequently found on builds featuring a carbine gas system and chambered in 5.56 NATO, making it a solid choice for tactical setups and compact configurations.
Specifications
Geissele Automatics MK4 10.5" M-LOK Super Modular Rail Black
Build history on GunPartPicker
Builders have been adding the Geissele Automatics MK4 10.5" M-LOK Super Modular Rail Black to their builds on GunPartPicker since February 2026. All time, it ranks #136 of the 683 handguards builders have added.
It was in stock most days in August 2026, and today 6 of the 7 retailers we track have it in stock. It dipped to $244.67 at Brownells for a stretch in August 2026, well under its usual $325, so sales do come around. Buying today, the lowest price is $268.24 at KY Gun Company, above August's low of $244.67, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
The part most often added in each category by the 6 builds that include this one
Wilson Combat AR-15 Billet Upper Receiver
Radian Weapons Talon Ambidextrous Safety Selector 2-Lever KIT - Radian Grey
Magpul MOE-SL Grip Polymer Dark Earth
Aero Precision Stripped M4E1 AR-15 Lower Receiver - Special Edition - Freedom
Expo Arms Combat Series 11.5" 5.56 NATO Chrome Lined AR-15 Barrel - Socom Profile - Carbine Length
Cryptic Coatings 5.56 NATO AR-15 Bolt Carrier Group - Mystic Bronze
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all 2 →Builds in the community that include the Geissele Automatics Llc Mk4 10.5" M-Lok Super Modular Rail Black
| Build | Parts | Total |
|---|---|---|
 | 21 | $1898.36 |
 | 26 | $3300.73 |
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