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Dec 05, 2025 - 08:37 AM
We’ve provided several answers to questions related to Amped PreBuilt HPA Gearbox | Drop-In HPA V2 Gearbox , see some other helpful Q&A related to this product.
Question: Can I choose which HPA unit is included with the gearbox?
Answer: Yes, you can select your preferred HPA unit to be installed in the hpa gearbox v2. This customization ensures compatibility with your preferred air delivery system for optimal performance.
Question: Would this fir into classic army px9
Answer: We are honestly not sure if it will fit. It is a standard v2 gearbox but it has a "Quick change spring" system which leads us to believe probably not.
I can ask my tech team about this though.
View all Amped PreBuilt HPA Gearbox | Drop-In HPA V2 Gearbox Questions & Answers
