PolarstarJACK Conversion Kit V2 M4/M16

The JACK™ system was designed to answer the demand for an affordable, high performance HPA (High Pressure Air) conversion for AEG's. The system is a drop-in cylinder replacement that is universally compatible with a wide range of gearbox versions that have center-line nozzles.

Similar to its sister product, the F1, it replaces the original gearbox components with a programmable pneumatic system allowing for higher performance and greater reliability over a gear driven system. Although economically priced, JACK™ still retains the same performance and quality you have come to expect from PolarStar products.

JACK™ has only 1 moving part, the nozzle, which acts as its own poppet valve which is piloted by the solenoid. With the exception of the poppet being integral to the nozzle, the valve is similar to the poppet valve used in the previously released Fusion Engine™ and is what gives JACK™ its signature muzzle report. The system itself only has 6 parts and can be completely disassembled by hand in a matter of seconds so the system is very reliable and easy to maintain.  

Just like all other PolarStar HPA conversions, JACK™ also allows for easy velocity adjustment. Using a standard M4 as an example, velocity can be adjusted from below 280fps and up to approximately 500fps with a .20g BB. This can be done simply by adjusting input pressure and poppet dwell to fine tune your rifles velocity in increments of just a few FPS at a time. Maximum velocity potential of the system will vary depending upon the barrels length and tightness of the bore. Longer and tighter barrels will yield a higher velocity while shorter or wider barrels will be yield a lower velocity. 

As with all of PolarStar's electro-pneumatic conversion kits, you can quickly change and adjust key functions of JACK™ via the on-board FCU (Fire Control Unit) which is no bigger than an AEG's MOSFET and can easily fit inside of a rifles battery compartment along with a small Li-po battery. Using the FCU's five position joystick and LCD display you will be able to easily and precisely adjust such functions as the systems cyclic rate, fire modes and poppet dwell on the fly. 

Although efficiency was not a critical requirement during development, JACK™ does boast some highly respectable figures in this category. This is made possible by its compact and intelligently laid out design which minimizes dead volume resulting in better air flow, faster response and less air used per shot. As a result JACK™ is considerably more air efficient than a bone stock Fusion Engine™ when operating in the same velocity range.


Key Features

• Designed, manufactured and built in the U.S.A..
• Assembled from CNC machined aluminum components with high performance delrin nozzle.
• Universal cylinder design is compatible with numerous gearbox versions.*
• Optimized flow profile, firing point and flow path promotes superior shot consistency and accuracy.
• Capable of functioning in damp and sub-freezing climates without affecting performance or reliability.
• User selectable Semi/Full Auto, Semi Auto Only and Variable Burst modes.
• Independently adjustable velocity and cyclic rate.
• Auto Switch mode allows for proper selector configuration for specific models.
• Easy to use Fire Control Unit (FCU) with LCD display and five position joystick.
• Instantaneous trigger response. Faster than an AEG with a Li-po!

Required for operation: Complete TM Spec AEG rifle with gearbox, Regulated Air Rig, HPA Tank, Battery.

Model suitable for M4 AEG

Package include :

- Polarstar JACK

- trigger board

- FCU (choose your model)

More about the mini FCU :

The new PolarStar Mini FCU is a more compact and less expensive option for single-solenoid HPA systems.

New voltage regulators allow for extremely low power consumption in sleep mode. Drawing under 28uA while idle, the Mini FCU is over 300 times more efficient than the original Standard FCU and can operate in sleep mode for close to one year on a small 250mAh pack.

Elimination of the solenoid MOSFET, joystick and LCD, along with careful selection of the remaining components, allowed the size of the Mini FCU to be reduced significantly compared to other FCUs. It's small size allows the Mini FCU to fit inside the gearbox shell keeping the control unit and wire harness protected from damage.

Despite it's size, the Mini FCU actually expands on the functionality of the Standard FCU by adding an integral Motor Control Unit and support for 4-position selectors. In order to make setup as easy as possible the MCU output port can be used with either a box mag or optional speaker to provide feedback during programming.

Ultra-Low Power Voltage Regulator

Like the Standard FCU, the Mini FCU automatically enters sleep mode just seconds after the last shot fired. Unlike the Standard FCU, the Mini draws under 30uA (micro-amperes) while sleeping. In order to achieve such low power usage the Mini FCU uses two voltage regulators to reduce the battery pack voltage to the 5VDC used by the FCU and solenoid. The first is a small regulator with extremely low quiescent current (current draw while sitting idle), used to supply power to the microcontroller. The second regulator is a larger, higher current regulator used to power the solenoid. This regulator is shut down until the solenoid is energized, effectively reducing it's idle current to zero. The combination of these voltage regulators and the IO pin configuration allow the Mini FCU to draw as little as 28uA when in sleep mode. To put that into perspective, the Mini FCU could run in sleep mode for over 300 days on a small 250mAh battery pack.

Programming The Mini FCU

Since there is no joystick or screen, the Mini FCU is programmed through a series of menus controlled by the trigger. To enter programming mode hold the trigger while plugging in the battery. If the trigger is not released after 5 seconds the unit will reset to factory defaults, otherwise it will enter the main menu. The standard menu consists of settings for:

• 1 - ROF
• 2 - Dwell
• 3 - Selector Position 1
• 4 - Selector Position 2
• 5 - Max Semi Auto ROF
• 6 - MCU Enable

Once in the main menu the unit will wait for trigger input.