AEG Air Volume: Match the Compression Assembly

An AEG does not gain consistent compression from one part alone. The piston head, cylinder, cylinder head, nozzle, bucking and barrel must work as a matched system. Before buying parts, find the leak or mismatch instead of replacing the whole assembly at once.

Check the system in sections

1. Piston group: inspect the piston-head O-ring, cylinder wall and piston travel.
2. Cylinder head: confirm the head is secure and its seal is undamaged.
3. Nozzle path: check nozzle movement, the nozzle-to-cylinder-head seal and the required nozzle profile.
4. Hop-up interface: inspect the bucking lips, chamber alignment and barrel position.

Air volume is not a single ratio

Cylinder porting, piston travel and barrel dimensions all affect the amount of usable air. A larger nominal cylinder volume is not automatically better. The correct combination depends on the complete build and must be verified after assembly.

Use repeatable checks

Test one section at a time, reassemble the gearbox correctly, then verify the finished replica with the same BB weight and a chronograph. A hand compression test can help locate a leak, but it does not prove feeding, timing or field performance.

For nozzle selection and measurement boundaries, read the POM air nozzle guide. Browse replacement parts only after identifying which part of the system needs attention.