Polarstar Jack HPA Engine Air Nozzle for MP5-A4, TFB, Echo 1, CYMA

Your HPA engine is only as consistent as the seal between its nozzle and the bucking lips. Over time, factory nozzles wear, and a losing air seal shows up as velocity variance, erratic groupings, and wasted pressure. This Polarstar nozzle restores that seal on Jack engines running in MP5-A4 style bodies.

Why it matters. The nozzle is the component that sits directly behind the BB inside the hop-up chamber. When it seals cleanly against the bucking, every shot gets the same air volume and the same push. When it leaks, you get shot-to-shot inconsistency that looks like a hop-up problem but is really an air-seal problem. A tight nozzle is the cheapest accuracy upgrade on the platform.

What you get. Machined Delrin construction, 1.75 inches long. This is the length that fits MP5-A4 platform rifles from Tokyo Marui, Echo 1, CYMA, and other compatible builds running a Polarstar Jack HPA engine. If your setup matches, this drops right in.

Replaces the factory nozzle on your Jack engine. Installation requires removing the outer barrel to access the hop-up chamber area, and you should verify the seal against your bucking after install by checking for consistent velocity on a chronograph.

Includes federally mandated disclaimer: this is an airsoft part only, sold separately from any replica.