RetroArms CNC Gearbox V2 QSC, 8mm

CNC Gearbox V2 QSC (Version 2025+) by RetroArms.

Made from aerospace-grade aluminum EN AW 7075 T651 with strength exceeding steel.

QSC quick spring change system.

Precision CNC machining for maximum compatibility and durability.

Reinforced construction.

Compatible with Tokyo Marui V2 (M4) AEG standard.

Screws and QSC spring guide are included.

Technical Specifications

• Model: AEG Gearbox V2 (TM Standard)
• Type: Full
• Bearing hole diameter: 8 mm
• Material: CNC-machined aluminum EN AW 7075 T651
• Version: 2025+

Package Contents

• CNC Gearbox V2 QSC
• Screw set
• QSC Spring Guide

Warnings

• Do not use cylinder heads with rubber bumpers (MAXX, FPS). This can permanently damage cylinder head mounting points, which is not covered under warranty. The rubber bumper can be removed, and washers can be used instead.
• The gearbox is optimized for JeffTron Leviathan and Scylla MOSFET units. Units from other manufacturers (e.g., PERUN) may require minor adjustments for proper fitting.
• When tightening screws, use a maximum torque of 1.2 Nm (medium-strength thread locker recommended).
• The gearbox has slightly smaller bearing holes (by 0.02 mm) to prevent bearing rotation after installation. Chamfered edges simplify installation. While designed for RetroArms ANTIROT bearings, standard round bearings can be used but should be glued (ensure adhesive does not contact the bearing surface).
• Proper alignment of the gearbox within the receiver is crucial to ensure a straight axis between the chamber, nozzle, and gearbox. This requires advanced technical skills. Installing a CNC gearbox correctly involves expertise in gear shimming, motor gear engagement, AOE tuning, tappet plate movement, cylinder head positioning, securing the spring guide, proper MOSFET installation, and fine-tuning the entire assembly within the replica body. Selecting the correct nozzle length, hop-up bucking, and chamber fitment is also essential. This is not a plug-and-play upgrade and should not be attempted by inexperienced technicians.
• Some manufacturers may require the use of the original spring guide or a modified guide for proper installation.