PolarStar JACK Nozzle No.5

PolarStar JACK Nozzle No. 5

Selecting the correct nozzle is one of the most important parts of any PolarStar JACK installation. The PolarStar JACK Nozzle No. 5 (#5) is an authentic OEM replacement component that provides the precise nozzle length required for specific rifle platforms, ensuring reliable feeding, consistent FPS and maximum air efficiency.

Unlike traditional airsoft nozzles that are named after a single rifle, PolarStar uses a numbered nozzle system because manufacturers often produce different gearbox and hop-up dimensions, even for replicas of the same firearm. This means multiple brands of the same model can require different nozzle lengths. The #5 nozzle is the correct choice for many A&K SR-25, JG SR-25, and ICS SIG 550/551/552 rifles, although compatibility should always be confirmed before installation.

Manufactured from high-quality Delrin, the No5 nozzle offers low friction, excellent wear resistance and long service life. The precision-machined dimensions help create a dependable seal between the JACK engine and hop-up chamber, improving consistency while reducing unnecessary air loss.

The No5 nozzle features a  24.5mm (0.9635 inch) tip length and an overall length (OAL) of 46.2mm (1.816 inches), matching PolarStar’s factory specifications for this nozzle size.

Whether you’re replacing a damaged nozzle, rebuilding your HPA engine or converting a compatible rifle, using the genuine PolarStar No5 nozzle helps maintain the performance and reliability expected from a factory JACK installation.

Why Choose the PolarStar JACK Nozzle No5?

The nozzle is responsible for correctly aligning with the hop-up chamber while sealing the air path during every firing cycle. Using the correct nozzle length significantly improves feeding reliability, air seal consistency and overall HPA performance. Genuine PolarStar nozzles are manufactured to precise tolerances, making them the preferred choice when servicing or upgrading your JACK engine.

Compatibility

Commonly used with:

• A&K SR-25
• JG SR-25
• ICS SIG 550
• ICS SIG 551
• ICS SIG 552

Compatibility is determined by nozzle length rather than rifle name. Always confirm your required nozzle number before installation.

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Alternative Product Names

• PolarStar JACK Nozzle #5
• PolarStar Nozzle No5
• PolarStar JACK Replacement Nozzle 5
• PolarStar HPA Nozzle #5
• JACK Engine Nozzle No5
• PolarStar Delrin Nozzle #5

JACK Centerline Nozzles: TIP = F + B – (A/2) – 2.3mm (0.0875 Inch)

Whether you’re repairing an existing HPA build or completing a new JACK installation, the genuine PolarStar JACK Nozzle No5 delivers the precise fit, dependable air seal and consistent feeding needed to keep your HPA system performing at its best.