MDT Adjustable Thumb Rest Fits M LOK Matte Finish Black 106900 BLK UPC 990482713973
Product Description
The MDT® M-LOK Adjustable Thumb Rest in Matte Black (SKU: 106900-BLK / UPC: 990482713973) is an ergonomic rifle control accessory engineered specifically for competitive PRS/NRL match shooters, long-range precision marksmen, and tactical carbine operators. Developed to eliminate support-hand migration and deliver a repeatable reference index, this adjustable rest provides a firm, consistent anchor point along your rifle forend or chassis. By anchoring the support-hand thumb, shooters achieve improved lateral weapon drive, reduced muscular fatigue, and faster recoil recovery during dynamic positional engagements.
Molded from high-strength, glass-reinforced engineering polymer, the thumb rest withstands severe environmental exposure, thermal transfer from high-round-count barrel heat, and harsh cleaning solvents without degradation. The contact face features aggressive molded surface texturing that delivers unyielding mechanical traction whether running bare-handed or operating with heavy tactical gloves in wet, muddy conditions. Engineered with built-in angular adjustability, the rest can be rotated and clocked prior to final torque, allowing shooters to match the exact natural bio-mechanical cant of their wrist and palm.
Requiring only a single standard M-LOK slot, the low-profile design protrudes roughly one inch, providing generous leverage without creating unnecessary snag hazards on barricade bags or support props. The ambidextrous geometry allows seamless left- or right-side staging along the forward forend as a driving index, or directly adjacent to the pistol grip on chassis systems equipped with rear M-LOK slots for traditional thumb-forward precision shooting. Complete with Mil-Spec steel M-LOK mounting hardware, the MDT Adjustable Thumb Rest delivers custom-tailored rifle control in an ultra-lightweight, durable package.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct mounting to all genuine M-LOK slots across precision rifle chassis (MDT ACC, LSS, ESS, Oryx) and tactical AR-15 / AR-10 handguards (occupies 1 direct M-LOK slot). CRITICAL: Direct attachment is NOT compatible with Picatinny 1913 or legacy KeyMod slots without intermediate adapter hardware. Ambidextrous and reversible configuration: adjust the rotational angle to match your support-hand wrist angle before fully tightening. Fastener torque specs: Torque steel M-LOK screw to 35 in-lbs on aluminum chassis/handguards (or 15 in-lbs on composite/polymer forends). Do not over-torque.
- Visually and physically confirm the host firearm is completely unloaded, magazine detached, bolt open or removed, and all ammunition cleared from the staging bench.
- Thread the included steel fastener through the thumb rest body into the M-LOK T-nut, setting the initial gap slightly wider than the chassis wall thickness.
- Position the T-nut horizontally, insert the assembly into the chosen M-LOK slot along the forend or chassis sidewall, and bias the assembly forward against the rail recoil lug.
- Clock the angular position of the thumb rest to match your natural support-hand grip angle, holding the position firmly.
- Torque the mounting screw using an armorer torque wrench until the T-nut rotates 90 degrees and clamps flush (35 in-lbs for aluminum rails, 15 in-lbs for polymer forends), verify zero movement under pressure, and stage for live-fire positional drills.
Key Features
- Custom Angular Adjustability: Adjustable rotational axis allows precise fine-tuning to fit your natural hand geometry and wrist angle.
- Repeatable Indexing Point: Establishes an unyielding tactile reference for the support thumb to control muzzle jump and streamline barricade driving.
- High-Strength Reinforced Polymer: Crush-proof, heat-resistant composite construction resists barrel heat soak, impact, and chemical solvents.
- Aggressive Molded Texturing: High-traction traction surface prevents thumb slipping under heavy recoil, rain, sweat, or glove use.
- Single M-LOK Slot Footprint: Occupies just one M-LOK rail slot, preserving rail space for external chassis weights, bipods, and ARCA rails.
- Ambidextrous Staging: Mounts on either left or right forend flats, or near the grip frame for thumb-forward benchrest and PRS shooting techniques.
Product Specifications
- Brand: MDT® (Modular Driven Technologies)
- Model/Series: M-LOK Adjustable Thumb Rest
- MPN / SKU: 106900-BLK / 106900BLK
- UPC: 990482713973
- Mount Interface: Magpul® M-LOK® (1 Standard Slot)
- Chassis Metallurgy / Material: Glass-Reinforced High-Strength Polymer
- Hardware Metallurgy: Heat-Treated Carbon Steel Fastener & T-Nut
- Finish / Color: Matte Black
- Protrusion: Approximately 1.00 in (25.4 mm)
- Hand Orientation: Fully Ambidextrous (Left or Right Side)
- Fastener Torque Spec: 35 in-lbs (Aluminum Rails) / 15 in-lbs (Polymer Forends)
- Platform Compatibility: Precision Rifle Chassis, AR-15/AR-10 Handguards, and M-LOK Forends
- Country of Origin: Canada / United States
