Retro Arms CZ Billet CNC 8mm Ver.2 Gearbox Shell for M4 / M16 Series AEGs
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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. Combined with reinforcement of key stress points and stainless steel connecting bolts, the gearbox shell has undergone extensive stress tests with M160 springs without any signs of wear.
- Precision machined from a block of billet EN AW 7075 T651 aluminum
- Quick change spring guide system
- 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
- Compatible with Tokyo Marui, G&P, Matrix and other compatible M4 / M16 Series Airsoft AEG Rifles (Modification may be required depending on brand and model)
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