Airsoft Gearbox Guides & Technical Articles

Replace a motor pinion only after confirming the motor-shaft interface, pinion dimensions and bevel-gear compatibility. Pull-on, press-on and set-screw designs require different tools; forcing the wrong method can damage the shaft or motor bearings....

Adjust the hop-up to give the BB enough backspin for a stable flight path. Use the BB weight you normally play with, make small changes and judge the full trajectory rather than the first...

A piston head should be selected as part of the AEG compression assembly, not by material alone. Check cylinder fit, O-ring behavior, venting, mass and assembly condition before deciding whether the original part needs...

Shimming sets the side-to-side position of each gear inside an AEG gearbox. The aim is controlled axle play and clean gear engagement without forcing the gearbox shell closed. A gearbox that spins freely when...

An AEG hop-up bucking must fit the barrel and chamber while presenting a consistent contact patch to the BB. A hardness number alone cannot identify the best bucking because brands use different compounds, geometry...

Premature engagement occurs when the sector gear begins picking up the piston before the piston has completed its forward travel. Continuing to fire a build that shows impact damage or abnormal cycling can damage...

An AEG spring affects the load placed on the complete drive train. Choose it around the field limit and the condition of the gearbox, not from an assumed FPS number printed beside a spring...