Airsoft Internal Parts & Upgrades

Internal parts are the gearbox, motor, cylinder, piston, nozzle, springs, hop-up units, buckings and inner barrels: what you change to repair a gun or tune it.

Parts are specific to gearbox versions and platforms (a V2 part will not fit a V3), and a stronger spring can take a gun over a site's power limit. Check fit and chrono after any change.

The catalogue lists 1,282 internal parts; the brands with the most are ASG (ActionSportGames), FPS, Maple Leaf, Umarex and Retro Arms.

Gearbox versions explained →