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ASG 16603 CNC aluminium cylinder head installed in Version 2 gearbox

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Compression you can rely on

The cylinder head is the seal between your cylinder and the air nozzle, and a poor one quietly robs you of consistency. This ASG Ultimate head is CNC-machined from aluminium and fitted with double rubber seals to keep compression loss to a minimum, so every shot leaves the barrel with the air behind it.

Smarter air delivery

A trumpet-shaped internal bore channels air cleanly into the nozzle, improving delivery to the BB for tighter, more repeatable performance shot to shot.

Protects the whole gearbox

Hard cycling is brutal on a gearbox. A built-in rubber pad soaks up piston impact, while a rubber ring on the outer flange cushions the head against the shell, helping prevent the cracked gearbox front that plagues high-powered builds. The steel nozzle nose adds durability exactly where wear is highest.

Ready for serious builds

The firm rubber surface holds up to double sector gear setups and stronger springs, so this head suits everything from a tidy stock refresh to an aggressive upgrade. Find more internal upgrades in our airsoft accessories range, or let our Kent airsoft servicing team install it.

General
BrandASG
ColourBlue
Platform The gun type and the real-world design it is based on.M4 / M16 AEG
Other
Model16603
TypeCylinder head
GearboxVersion 2
MaterialCNC aluminium, anodised
Nozzle noseSteel
SealsDouble rubber seals
Air deliveryTrumpet design bore
Shock absorptionBuilt-in rubber pad
Gearbox protectionRubber ring on outer flange
High-stress useDSG and strong-spring capable

Frequently asked questions

Which gearbox does this cylinder head fit?

It is made for Version 2 gearboxes, found in M4, M16 and many other AEGs. The blue anodising is ASG's colour code for the V2 head.

How does it improve performance?

Double rubber seals cut compression loss and the trumpet-shaped bore feeds air more efficiently to the nozzle and BB, giving more consistent, efficient shots.

Will it protect my gearbox?

Yes. A built-in rubber pad absorbs piston impact and a rubber ring on the outer flange cushions the shell, which helps guard against the front-end cracking common under hard use.

Can it handle a strong spring or DSG setup?

It is designed to. The rubber surface stays firm even for double sector gear builds and higher spring rates, making it suitable for upgraded rifles.

Is the nozzle contact area durable?

The nose of the head is steel rather than aluminium, so the high-wear contact point resists deformation for long-term reliability.