The VFC ECS Version 2 — Gearbox Shell Set is the genuine replacement kit designed for AEG maintenance and tuning on M4/M16 platforms. Built for builders and technicians, this “next version” gearbox shell features a quick spring change system that speeds up tuning operations. The set includes 8 mm bearing bushes and a spring guide to improve gear rotation smoothness and longevity under heavy use — an excellent base for speed builds and reliable upgrades.

Technical specifications

Product: Genuine VFC — ECS Version 2 gearbox shell set.

Compatibility: M4 / M16 platforms and compatible AR-style replicas.

Key feature: quick spring change system for faster tuning and spring swaps.

Included parts (manufacturer-stated): 8 mm bearing bushes, spring guide.

Recommended use: repairs, upgrades and speed preparations for AEGs.

Package contents

1 × Version 2 gearbox shell (VFC ECS).

1 × set of 8 mm bearing bushes.

1 × spring guide.

Additional small parts/hardware if supplied by the manufacturer (check packaging).

User benefits

Faster installation and maintenance thanks to the quick spring change feature.

8 mm bearing bushes deliver enhanced durability and smoother gear operation under load.

Genuine VFC part ensures correct tolerances and direct compatibility with VFC M4/M16 receivers.

Solid foundation for further upgrades (gears, piston, motor, etc.).

Warnings & information (GPSR & Italian law compliant)

Keep out of reach of children.

Intended for use on softair replicas (AEG) and for technical repair/upgrade purposes only; not a part for real firearms.

Do not tamper with, modify or alter the shell or included parts beyond manufacturer intent; tampering may impair function and safety.

Install only with the replica unloaded and by experienced personnel or qualified technicians; remove battery and magazine before working.

Use proper tools and follow manufacturer technical guidance; avoid excessive force during assembly.

Avoid aggressive solvents on surfaces; lubricate and maintain with ASG-appropriate products.

Store in a dry, ventilated place away from direct heat.

It is forbidden to tamper with the product in any way.