BD Custom 16:1 Improved 4mm Axis Gear Set

The BD Custom 16:1 Improved 4mm Axis Gear Set is a good gearset specially developed for high speed builds and should therefore be seen as an upgrade.

The gearsets that are standard in most airsoft replicas are 18:1 ratio. Everything below is suitable for high speed such as 16:1 and / or 13:1. This will increase your trigger response/ROF (Rate of Fire).