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Built for extreme tuning

When you push an AEG into the 170-190 m/s range, gearbox pressures rise dramatically and standard parts give up. The ASG Ultimate M190 half-teeth polycarbonate piston is engineered for exactly this kind of extreme tuning.

Stronger polycarbonate

It is moulded from a polycarbonate resin that is 50% stronger than other Ultimate high-performance pistons. That extra strength means it can shrug off the loads generated by high-power springs and aggressive gear sets.

The best of both materials

The design combines polycarbonate teeth, which absorb impact energy on first contact, with embedded steel teeth for maximum strength as the piston travels rearward. A reinforcement bar adds further structural strength to the teeth for high-speed reliability.

A precise fit

All dimensions are reworked to fit perfectly inside ASG Ultimate gearboxes for smooth, low-friction cycling, though modifications are needed for Classic Army shells. Explore more airsoft accessories and upgrade parts.

Bought from the specialists: our in-house workshop in Rochester, Kent can service, repair and upgrade your kit. See our airsoft gun repair and servicing.

General
BrandASG
ColourRed
Other
Power range170-190 m/s extreme tuning
Material50% stronger polycarbonate resin
Product typeAEG upgrade piston
TeethHalf teeth with embedded steel
GearsFor use with half-tooth gear sets
Design fitUltimate gearboxes (mods needed for Classic Army)
FeaturesReinforcement bar, low-friction profile

Frequently asked questions

What power level is this piston for?

It is designed for extreme tuning in the 170-190 m/s range, where gearbox stresses are very high, making it suited to high-power and high-speed builds.

Why does it mix polycarbonate and steel teeth?

The polycarbonate teeth absorb impact energy on first contact, while the embedded steel teeth provide maximum strength against breakage as the piston travels further back.

What gears do I need to use with it?

It is a half-teeth piston, so it must be paired with a matching half-tooth gear set for correct engagement and timing.

Will it fit any gearbox?

It is dimensioned to fit perfectly inside ASG Ultimate gearboxes for smooth, low-friction performance. Modifications are required to use it in Classic Army gearboxes.

Is this an internal upgrade part?

Yes. It is an internal AEG tuning component intended for experienced builders assembling high-performance gearboxes.