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Jun 21, 2026 - 10:24 AM
We’ve provided several answers to questions related to Open Box | MechLabs NEXXUS M4/AR Drop In HPA Engine | Factory Refurbished , see some other helpful Q&A related to this product.
Question: What type of engine does this product use?
Answer: This product uses a Drop In HPA Engine. HPA stands for High Pressure Air, which is a system that replaces traditional airsoft gearboxes to provide more consistent performance and easier tuning for serious players.
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