Custom PolarStar Jack HPA M4 – Ready to Play Selling my PolarStar Jack HPA M4 build. The gun is in great condition and runs flawlessly with no issues. It’s a super consistent and reliable setup that’s perfect for both indoor and outdoor fields. Build Details: • PolarStar Jack HPA engine • Prowin hop-up / barrel setup • Full metal M4 platform • Smooth trigger response and consistent shots Attachments Included: • Red dot optic • Mock suppressor • Rail system for additional accessories The gun is already set up and ready to go—just hook it up to your HPA tank and you’re good to play. Great option if you want a solid HPA rifle without having to build one yourself. Feel free to message me with questions or for more pictures.