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PolarStar Jack V2 HPA Unit | Standard FCU | V2 M4 HPA Kit Reviews

4.7 Rating 68 Reviews
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PolarStar Jack V2 HPA Unit | Standard FCU | V2 M4 HPA Kit
The Polarstar “JACK” was designed to answer the demand for an affordable, high performance HPA conversion for AEG's. The system is a drop-in cylinder replacement that will be 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” will still retain the same performance and quality you have come to expect from PolarStar.The JACK system only has 1 moving part, the nozzle, that acts as its own poppet valve (similar to the Fusion Engine poppet) which is piloted by the solenoid. The system itself only has 6 parts and can be completely disassembled by hand, making the system very reliable and easy to maintain.
The JACK is extremely efficient. The patent pending design of the F1 allows for the most direct air path to the nozzle with minimum dead volume resulting in better flow, faster response and less air used per shot. Using a stock VFC M4 as a test platform, the JACK was able to fire approximately 1000 rounds for a 13ci/3000psi cylinder before pressure dropped below regulated output.
Features:
CNC aluminum components with high performance delrin nozzle
Universal cylinder design allows for use with most gearbox versions
Optimized air flow promotes consistency and accuracy.
Adjustable velocity and cyclic rate w/ FCU
High performance and reliability, even in sub-freezing weather
FCU programmable Semi Auto, Full Auto, and Burst modes
Airsoft Polarstar JACK ECU / FCU included 
 
Tech Specs:
Nozzle Type: TM M4 SeriesRate of Fire: Up to 30RPS+ (The maximum cyclic rate of the Jack is affected by several factors, however, 30 rounds per second is a conservative number. Most configurations will exceed this easily.)Air Efficiency: 1000 shots from 13/3000 @ 1.5J (80PSI w/ .28g) Fire Modes: Semi Auto, Semi Only, Full Auto, Variable Burst ModesPSI Range: 40 PSI - 130 PSI * Do not exceed for risk of damagePackage Includes: Pre-Assembled JACK Conversion KitBattery: 7.4v-9.6v NiMH or Lipo (Not included).
Need an IGL Line? Check our our Amped IGL lines:AMPED - IGL (For Wolverine SMP & PolarStar JACK)
Did you know we had our own AMPED Jack?PolarStar - Amped JACK (V2/M4)

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I really like my v1 jack it performs great and the responsiveness is wild. The FCU is kinda lackluster in features tho.
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Posted 2 years ago
Thanks for the feedback and review!
Posted 2 years ago
It has me going on the days
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Posted 2 years ago
It doesn’t really work
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Posted 2 years ago
Hey there, Jack If you're having an issue with the engine that you purchased through us, you should email our customer support at: sales@ampedairsoft.com. If it's something simple we would like to help you further with this issue and have a tech look over it. Send us pictures and videos of the issues in question and we will get back to you when we are in on Monday! Thank you, Apple
Posted 2 years ago
It’s alright the only problems I have is that the fcu wiring is horrible and the wiring harness also has bad wiring
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Posted 2 years ago
If you ever have any issues, PolarStar warrants all parts. They can be reached at cs@polarstarairsoft.com.
Posted 2 years ago
Marcellius T
Verified Reviewer
The JG Golden Eagle MCR is a great budget way to get an LMG but it requires a ton of upgrades. I was going to upgrade all of the internals but decided to install the P* Jack, and it's a perfect fit. I have yet to test it out on the field but I am very eager to fully test this baby out.
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Posted 2 years ago
Love the GREEN! 😍
Posted 2 years ago
The quality was amazing and worked perfectly.
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Posted 2 years ago
It works good i like
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Posted 2 years ago
I order one of these and love it
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Posted 2 years ago