AOE in airsoft stands for "Angle of Engagement". This term describes the optimal angle at which the sector gear should start engaging the teeth of the piston and compressing the spring.
Incorrect AOE can lead to increased stress on internal components, especially the piston and gear teeth, affecting the overall performance and reliability of the weapon. On the other hand, correct AOE, combined with perfectly shimmed gears and motor adjustment, leads to higher rate of fire and less battery strain.

Fine-tuning AOE can be done in two ways (both methods achieve piston movement towards the spring guide, reducing the engagement angle of the gear teeth):

a) Using a spacer under the piston head

b) Increasing the buffer on the cylinder head (Sorbo pad).

Generally, a higher buffer on the cylinder head is the preferred solution. The increased buffer reduces the impact of the piston head, preventing an increase in piston weight, which could lead to greater stress on the mechbox (unless desired, such as in DMR builds with a power of 2J+ for higher performance on heavy ammunition).

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