Strength of steel and weight of aluminium, it is best for high-performance parts. Trigger is milled on CNC milling machine and has protective anodising of 5µm various colors (0,005 mm).
This trigger is designed from Tokyo Marui standard, what means that you can use it without any need of customization, or customization of trigger switch in every Aluminium and CNC gearboxes ver. II (only for M4 replicas).
New generation type can be recognised by milled mark on trigger.