What type of airsoft guns is this HPA unit compatible with? PolarStar Jack M249 HPA Unit | Standard FCU | M249 HPA Kit

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What type of airsoft guns is this HPA unit compatible with? PolarStar Jack M249 HPA Unit | Standard FCU | M249 HPA Kit

Status: Open Oct 30, 2025 - 10:02 AM

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Oct 30, 2025 - 10:02 AM

The Polarstar Jack M249 engine is compatible with only the M249 body, bu the base engine Jack is adaptable to different AEG bodies by changing the nozzle and the trigger board that is installed into the gearbox of each rifle.

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What type of airsoft guns is this HPA unit compatible with?

PolarStar Jack M249 HPA Unit | Standard FCU | M249 HPA Kit

“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 F... See More

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View More Product Details

PolarStar Jack M249 HPA Unit | Standard FCU | M249 HPA Kit

“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 F... See More

View Details

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What type of airsoft guns is this HPA unit compatible with? PolarStar Jack M249 HPA Unit | Standard FCU | M249 HPA Kit

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