Retro Arms CZ Billet CNC 8mm Ver.2 Gearbox Shell for M4 / M16 Series Airsoft AEG Rifles (Color: Black)

Features 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 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. Version 2 Retro Arms gearboxes feature a quick-change ball-bearing spring guide mechanism, allowing spring swaps in a matter of minutes without complete gearbox disassembly. Manufacturer: Retro Arms CZ Color: Black Specifications: Compatibility: For Tokyo Marui, G&P, Matrix and other compatible M4 / M16 Series Airsoft AEG Rifles (Modification may be required depending on brand and model) Material: CNC Billet EN AW 7075 T651 Aluminum Disclaimer: Please use discretion when installing custom parts as fit and compatibility may vary. Some modification may be required. Professional installation recommended.