The Silverback MDR-X  16” HPA is our airsoft licensed version of its real steel 7.62mm counterpart, manufactured by Desert Tech LLC.

Very realistic in its conception, to mimic the original build and features as much as possible while integrating a simple and extremely robust open-bolt HPA architecture, able to deliver high performance from DMR to CQB applications.

• Made under exclusive license from Desert Tech LLC

• Fully engraved markings with unique serial number.

• 6000 series aluminium receiver/outer barrel and muzzle brake.

• PA6 Nylon, fiberglass reinforced stock, grip and handguard, synthetic rubber buttpad.

• MLOK handguard, with 3 slots at 3, 6 and 9 o’clock.

• 2 steel QD attachments at the rear of the stock.

• Ambidextrous fire selector and 3 points magazine release.

• Simple and extremely robust open-bolt HPA architecture

• The MDRX HPA was designed to provide excellent reliability, outstanding feeding consistency, wide power adjustability, and very high rate of fire capability while keeping maintenance requirements to a minimum.

  Developed around an industrial-grade 3V110-06 NCF 3/2 solenoid valve powered by 12 V DC. This industrial valve architecture provides extremely high reliability, low maintenance requirements, and an affordable price.

  In our HPA engine, the airflow used to propel the BB does not pass through the solenoid valve itself. The valve only controls the movement of the nozzle:

  • When energized, air pressure pushes the nozzle forward and chambers a BB

  • Once deployed, air flows directly through port(s) machined into the nozzle itself to propel the BB

  The nozzle movement is entirely pressure driven, with no return spring and only one moving part.

  The pneumatic assembly contains only 4 parts and 5 seals, including only 3 dynamic FKM/Viton seals. The nozzle itself is manufactured from POM in order to reduce friction, reduce mass, and avoid damaging BBs.

  When the valve is deactivated, the air used to actuate the nozzle is vented directly inside the lower receiver through the valve exhaust port. Because propulsion airflow bypasses the valve entirely, the valve flow rate does not limit the maximum achievable power.

• Pressure Range & Performance

   

  The system operates between 4 and 8 bar (58 to 116 PSI). However, the best accuracy and consistency are generally achieved at lower pressures, typically between 4.5 and 6.5 bar (65 to 94 PSI).

  For this reason, Silverback recommends:

  • Using the least restrictive nozzle possible

  • Using heavy BBs whenever possible

  The system benefits significantly from Joule Creep with heavy BBs.

  The MDRX HPA is capable of:

  • Up to 40 BBs/s with ease (*)

  • Up to 50 BBs/s with advanced tuning and higher operating pressures (*)

  • Nozzle Configurations

     

    Three nozzle configurations are available:

    1-hole nozzle

    Optimized for sub-1 Joule configurations.

    

    
    

    2-hole nozzle

    Recommended for 1 to 1.4 Joule configurations.

     

    6-hole / Full Flow nozzle

    Recommended for configurations above 1.4 Joules.

     

    Recommended for configurations above 1.4 Joules.

  • 

  • 

    For legal reasons, complete MDRX HPA rifles are factory-equipped with the 1-hole nozzle. The 2-holes and 6-holes / Full Flow nozzles are included as spare parts.

    Users are responsible for complying with local laws and power limits

  • he MDRX HPA uses a dedicated hop-up chamber specifically developed for this pneumatic system. A built-in feeder guides BBs directly toward the front face of the nozzle, ensuring extremely reliable feeding, perfect BB alignment, and complete elimination of double-feeds and misfeeds.

    The HPA engine and hop-up chamber are designed to self-align with each other for maximum consistency.

    The chamber accepts standard AEG-type hop-up buckings, however Silverback strongly recommends using SRS/TAC-41 type buckings for optimal air seal performance.

    All MDRX HPA rifles are factory-equipped with a Silverback SRS 80° hop-up rubber. A harder bucking provides improved stability and consistency with this HPA architecture.

    HPA-Specific Hop-up System

     

    Suppressor Recommendation

  • The use of a Silverback suppressor is strongly recommended with the MDRX HPA platform. The pneumatic system produces very noticeable sound reduction when paired with an efficient suppressor.

     

    

    Air & Battery Consumption

     

    Under optimal conditions, the system is capable of approximately 2000 to 2500 shots using a 0.8 L / 48 ci air tank filled to 207 bar / 3000 PSI.

    The system requires one 11.1 V LiPo stick battery. A 1200 mAh battery typically provides enough capacity to empty several air tanks.

  • Fire Control Unit (FCU)

    

    
    

    Developed in collaboration with T238, the FCU allows adjustment of:

    • Fire modes (safe / semi / 3 to 5 BBs burst / full auto / binary) (*)

    • Dwell setting (0.5 ms increments)

    • ROF adjustment (12 to 50 BBs/s) (*)

    • DMR cool-down timer (0.5 to 5 s or disabled)

    • Battery protection level (3.3 to 3.0 V/cell or disabled)

    • Sleep timer (1 to 10 h or disabled)

    Additional FCU functions include current program readback, total BB counter, daily BB counter, factory reset, and daily counter reset.

     

     

     

    The MDRX is coming with:

     

    • 78 rounds AR10/SR25 type magazine (**)

    • 2-holes and 6-holes / Full Flow extra nozzles

    • A pin puncher for easy battery change and disassembly.

    • Allen key 2mm and 5mm.

    • One high nub for the hop up unit, to lift bbs from 0.32 grams and above (low nub installed out of the box).

    • One extra ball plunger for the hop-up unit.

     

     

     

    Video Tutorials

     

    Nozzle Swap

    How to change the nozzle configuration:

     

    FCU Programming Introduction

    Introduction to FCU programming and settings:

     

    Dwell Setup

    How to properly adjust dwell for optimal efficiency and consistency:

     

    
    

    User manual and exploded views:

     

    • MDRX HPA FCU user manual

    • MDRX HPA FCU user manual (Advanced version)

    • MDRX HPA ENGINE, exploded views

    • MDRX AEG/HPA common user manual

    • MDRX AEG/HPA common exploded views

     

    
    

    (*) For German market, the MDRX HPA FCU is permanently locked in semi-auto and ROF setting is inoperative.

    (**) While compatible with most standard low/midcap AEG Ar10/SR25 mags, we can’t guarantee compatibility for each different brand/type, modifications might be required to use other brands magazines.