Retro Arms CZ Billet CNC Ver.2 Gearbox Shell for HPA Engines
Unlike most other gearbox shells on the market, the Retro Arms CZ gearbox shells are precision CNC machined out of a solid block of billet EN AW 7075 T651 aluminum giving them unmatched durability and resilience.
- Precision machined from a block of billet EN AW 7075 T651 aluminum
- Durable anodized finish
- Reinforcement in key stress points to counter rapid wear from high performance parts
- Pre-radiused cylinder windows - helps evenly distribute impact force
- Deeper wire channels along base of gearbox
- Designed to fit with most popular HPA engines
