This category includes upgrade parts and spare parts for electric airsoft guns (AEG) used for maintenance, repairs, and performance upgrades. The core mechanism of an AEG is the gearbox, which houses the internal components responsible for firing the BB.

The selection includes components such as gear sets, pistons, piston heads, cylinders, cylinder heads, springs, spring guides, tappet plates, bushings, motors, and other internal parts used to maintain or upgrade the performance of an AEG.

Upgrading internal components can help increase durability, adjust power output, improve air seal efficiency, or change the rate of fire, allowing players to fine-tune their replica for different play styles and performance goals.

In this category you will find AEG internal upgrade parts and replacement components compatible with various airsoft platforms and gearbox versions.