RetroArms CNC Gearbox for ASG CZ Scorpion EVO 3
RetroArms CNC upgrade gearbox for the ASG CZ Scorpion EVO 3 platform delivers outstanding strength and long-term reliability even with stronger springs. The shell is CNC machined from a single block of EN AW 7075 T651 aluminum, eliminating weak points typical for cast alloy gearboxes. The design is dimensioned for high-power setups, but its main benefit is improved stability, more precise gear alignment, and extended service life under standard and heavy load. The QSC system allows quick spring changes without full gearbox disassembly. Installation requires advanced technical skills, including gear shimming, AOE adjustment, correct motor engagement, and proper centering of the gearbox inside the receiver. This is not a plug-and-play replacement.
Key Features of RetroArms CNC Gearbox

Aircraft-Grade EN AW 7075 T651 Aluminum
Extremely strong material with higher resistance than standard steel and minimal deformation under load.

QSC Quick Spring Change
Change power level within seconds without opening the gearbox (stock must be removed).

Reinforced Front Section
Larger radius and stronger front area reduce the risk of cracking with high-power springs.

Improved Gear Seating
Reworked geometry improves gearbox compatibility and stability under heavy load.

New Wiring Routing
Separates wires from moving parts for safer electronics installation.

CZ EVO 3 CNC Gearbox Shell Example

CNC gearbox shell for CZ EVO 3 platform machined from a single aluminum block (surface finish may vary).

Technical Specifications

Model: AEG gearbox ASG CZ Scorpion EVO 3
Version: 2025 plus
Material: CNC EN AW 7075 T651 aluminum
Bearing Hole Diameter: 8 mm (AntiRot holes)
Compatibility: ASG CZ Scorpion EVO 3 A1 (all versions)
Compatible Electronics: ASG EVO control units, JeffTron Leviathan EVO
Recommended Torque: Max 1.2 Nm

Package Contents

RetroArms CNC gearbox ASG CZ EVO 3 QSC
Screw set
QSC spring guide

Warning

Do not use ..

RetroArms ASG CZ Scorpion EVO 3 CNC Gearbox