JeffTron Scylla HPA V2 – Programmable HPA Control Unit, Rear Wiring, JST

JeffTron Scylla HPA V2 – Programmable HPA Control Unit with Rear Wiring and JST Connector

The JeffTron Scylla HPA V2 is an advanced electronic control system for HPA-powered airsoft rifles equipped with compatible Version 2 gearboxes.

It combines HPA solenoid control, electronic trigger sensing, programmable firing modes, detailed diagnostics and wireless mobile app configuration in one compact module.

Scylla replaces both the original HPA Fire Control Unit (FCU) and the trigger electronics, providing extensive control over the operation of the HPA engine.

This version features rear wiring with a JST connector.

Compatible HPA Systems

Scylla supports HPA engines controlled by 5V electropneumatic solenoids, including:

• PolarStar F2

• PolarStar F1

• PolarStar JACK

• Wolverine Inferno Gen 2

• Other compatible 5V solenoid-controlled HPA engines

Supported configurations include:

• Single Solenoid

• Dual Solenoid – Closed Bolt

• Dual Solenoid – Open Bolt

Compatibility with the specific engine and wiring arrangement should be verified before installation.

Optical and Magnetic Trigger Sensors

The unit combines optical and magnetic sensor technology for accurate trigger detection.

Electronic sensing reduces reliance on traditional mechanical trigger contacts and provides consistent response during repeated use.

The included magnetic trigger adapter allows trigger sensitivity to be adjusted directly through the mobile app.

The supplied adapter is intended for standard V2 triggers. JeffTron-branded triggers require a separate compatible adapter.

A mechanical trigger stop can be used but is not required.

Wireless Mobile App Programming

Scylla features integrated wireless communication and supports configuration through an app for:

• Android

• iOS

The app also provides a complete Czech-language interface.

Players can adjust trigger sensitivity, firing modes, solenoid parameters, rate of fire, shot delay, profiles and external output settings.

Configuration changes are applied in real time, allowing immediate testing.

Six Programmable Firing Modes

Scylla offers six firing modes that can be assigned to the rifle's fire selector positions.

SAFE

The rifle does not fire when the trigger is pressed.

SEMI

One shot per trigger pull.

BINARY TRIGGER

The rifle fires on both trigger pull and trigger release.

BURST

A programmable burst of 2–10 shots per trigger pull.

FULL AUTO

Continuous automatic fire while the trigger is held.

BURST / FULL AUTO

A combined mode in which:

• A partial trigger pull activates a programmed burst.

• A full trigger pull activates automatic fire.

These modes allow the rifle's operation to be tailored to personal preferences and field regulations.

Independent SEMI and AUTO Solenoid Settings

One of Scylla's most advanced features is the ability to configure different solenoid parameters for SEMI and AUTO selector positions.

Available settings include:

Poppet Dwell

Controls the duration of the air-release solenoid signal and can affect the air pulse and muzzle performance.

Nozzle Dwell

Controls nozzle timing for proper BB feeding in compatible HPA engines.

Return to Battery

Adjusts timing related to the mechanism returning to its ready position.

Rate of Fire

Controls the automatic firing rate.

Anti-Stiction Timeout

Defines a timing parameter for the Anti-Stiction function after a period of inactivity.

Anti-Stiction Pulse

Adjusts the additional solenoid pulse used by the Anti-Stiction function.

These independent settings allow different operating configurations for SEMI and AUTO modes.

The manufacturer also describes the possibility of using separate settings to reduce muzzle velocity in close-range gameplay.

Always verify muzzle energy with a chronograph after changing performance-related settings.

Adjustable Rate of Fire

Scylla allows the automatic firing rate to be reduced electronically.

This can be useful for:

• Meeting airsoft field rate-of-fire limits.

• Replicating realistic firearm cyclic rates.

• Customizing HPA performance.

• Creating different gameplay profiles.

Adjustable Shot Delay – 0.1 to 4.0 Seconds

The Shot Delay function prevents another shot for a specified period after firing.

The adjustable range is 0.1–4.0 seconds.

Possible applications include:

• Simulated reload delays.

• Simulated recoil-related pauses.

• Limiting semi-automatic firing speed.

• Custom training and gameplay configurations.

Custom User Profiles

Scylla allows players to save and quickly load configuration profiles.

Profiles can contain individual settings for trigger sensitivity, firing modes and solenoid operation.

Examples include:

CQB Profile

• Responsive trigger configuration.

• Settings for dynamic gameplay.

• Field-compliant firing modes.

DMR Profile

• Semi-automatic operation.

• Customized solenoid timing.

• Optional shot delay.

General-Purpose Profile

• Balanced trigger settings.

• Customized rate of fire.

• Saved HPA parameters.

Profiles may also store settings associated with different power configurations, but actual muzzle energy must always be measured.

Battery Voltage Monitoring

The mobile app displays the current battery voltage.

The system supports automatic battery recognition or manual selection of the correct battery type.

The manufacturer recommends a 7.4V LiPo battery.

Programmable External Output

Scylla includes an external output terminal for compatible accessories, such as an in-chamber BB illumination system.

The output voltage corresponds to the connected battery voltage.

Four output modes are available:

• OFF – output disabled.

• MOTOR – output activated during firing.

• MOTOR + Xs – output activated during firing and maintained for a configured period.

• ALWAYS ON – output continuously enabled.

Always verify electrical compatibility before connecting external accessories.

Advanced Statistics and Diagnostics

The mobile app provides detailed operating statistics, including:

• Original shot count transferred from the previous system.

• Total shot count.

• Individual shot timing.

• Burst firing time.

• Processor temperature.

• Total Scylla operating time.

• Rifle rate of fire.

• Battery voltage.

These features are useful for players, technicians and HPA system diagnostics.

Technician Lock

Scylla offers an optional Technician Lock feature designed to prevent unauthorized operation or unintended configuration changes.

Features include:

• Function locking to restrict changes.

• Maximum battery voltage limit.

• Saved technician configurations that users can restore.

• Timestamp recording when the configuration is locked.

This feature is particularly useful for custom HPA builds, premium rental equipment and professional airsoft technicians.

Ultra-Low Power Consumption

The unit has a stated idle current consumption of only 1.5 mA.

The recommended power source is a 7.4V LiPo battery.

Disconnect the battery during long-term storage.

Protective Coating

Scylla's electronics are covered with a protective coating designed to help prevent water-related damage.

This improves resistance to moisture but does not make the unit suitable for immersion.

Free Online Firmware Updates

JeffTron provides free online firmware updates, allowing new functions and improvements to be installed.

Compatible Airsoft Platforms

According to the manufacturer, Scylla HPA V2 can be installed in:

• M4 / M16 / HK416 / AR15 with TM-standard V2 gearboxes.

• SR25 with compatible TM-standard V2 gearboxes.

• ICS SSS V2 gearboxes.

• MP5 with TM-standard V2 gearboxes.

• G3 with TM-standard V2 gearboxes.

• G&G G2 V2 gearboxes.

• M249 with compatible TM-standard V2 gearboxes.

• Krytac M4.

• Snow Wolf M107 Barrett.

• Other compatible V2 gearbox designs.

Incompatible Gearboxes

The manufacturer lists the following as incompatible:

• S&T V2

• Arcturus V2

• Ares Amoeba V2

• APS eSilver Edge V2

• V2 gearboxes with microswitch triggers

Compatibility should be verified before purchase, especially with non-standard gearbox designs.

Key Features

• Programmable HPA control unit

• Replaces the original HPA FCU and trigger electronics

• Optical and magnetic sensors

• Magnetic adapter for standard V2 triggers

• App-adjustable trigger sensitivity

• Wireless configuration via Android and iOS

• Czech-language app interface

• Supports PolarStar F2, F1, JACK and Wolverine Inferno Gen 2

• Compatible with other 5V solenoid-controlled engines

• Single / Dual Solenoid support

• Open Bolt / Closed Bolt configurations

• Six programmable firing modes

• 2–10-round burst

• Binary Trigger

• Combined Burst / Full Auto mode

• Independent SEMI and AUTO solenoid settings

• Poppet Dwell and Nozzle Dwell

• Return to Battery

• Rate of Fire

• Anti-Stiction Timeout and Pulse

• 0.1–4.0-second shot delay

• Adjustable rate of fire

• Custom user profiles

• Advanced statistics and diagnostics

• Battery voltage monitoring

• Optional Technician Lock

• Four-mode programmable external output

• Free online firmware updates

• Moisture-resistant protective coating

• 1.5 mA idle current consumption

• Recommended 7.4V LiPo battery

• Rear wiring with JST connector

Technical Specifications

Package Contents

• 1× JeffTron Scylla HPA V2 electronic module with rear wiring and JST connector.

• 1× magnetic adapter for a standard V2 trigger.

• 1× gearbox mounting screw.

• 1× Dog Tag keychain.

• Fire selector plate stickers.

• 3× Scylla stickers.

• Online installation manual in English.

Installation Recommendations

Installation should be performed by an experienced airsoft technician.

Before installation, verify gearbox compatibility, HPA engine compatibility and connector configuration.

After installation, correctly configure trigger sensing, solenoid timing and firing modes.

JeffTron Scylla HPA V2 provides an integrated control platform for advanced HPA airsoft builds, combining precise trigger sensing, extensive solenoid programming, wireless configuration and detailed diagnostics in one compact system.