10 Umarex Ux Trevox Gas Piston of 2026 For Pellet Pistol Repairs

1

GoldenBall SHS Airsoft Piston for AEG (15 Teeth)

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• ARS Mark

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  10.0
• Brand
  GoldenBall

Key specs1

Powerplant Compatibility

This piston is designed exclusively for electric airsoft gearboxes with a 15-tooth gear drive. It cannot function inside a break-barrel pellet air pistol like the Umarex UX Trevox, which requires a sealed gas ram rather than a mechanical gear-driven piston rack.

Pros & cons32

Pros

• Features a 15-tooth rack configuration built for electric airsoft gearboxes
• Provides a dedicated replacement option for standard AEG internal setups
• Lightweight profile matches standard electric airsoft gearbox channels

Cons

• Designed strictly for AEG gearboxes and cannot fit break-barrel air pistols
• Lacks the sealed nitrogen gas ram construction required for Trevox repairs

2

AOLS Piston Head with Ball Bearing Mushroom Head Type -

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  10.0
• Brand
  AOLS

Key specs1

Gearbox Fitment

Machined from aluminum for Version 2, 3, and 7 airsoft gearboxes, this mushroom-style piston head addresses rotational spring friction. It is strictly an electric airsoft part and does not fit the sealed gas strut assembly of the Umarex UX Trevox.

Pros & cons32

Pros

• Precision CNC-machined aluminum body with an anodized finish resists surface wear
• Integrated ball bearing helps relieve spring tension inside AEG gearboxes
• Fits Version 2, Version 3, and Version 7 electric airsoft gearboxes

Cons

• Unsuitable for break-barrel pellet chambers that require integrated gas struts
• Sized at 0.94 inches wide specifically for airsoft cylinders rather than airguns

3

Phyxlyn 888-588 Piston Driver Assembly for NR38AK, MC150, 150XP Replaces

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  10.0
• Brand
  Phyxlyn

Key specs1

Intended Tool Platform

• Compatible with NR38AK 1-1/2 inch strip nailers
• Fits MC150 single-shot joist hanger tools
• Serves 150XP metal connector nailers
• Not compatible with break-barrel pellet airguns

Pros & cons32

Pros

• Constructed with heat-treated 6150 tool steel rated at Rockwell hardness 50-52
• Uses aerospace-grade 2024 aluminum for the piston driver body
• Direct replacement assembly for NR38AK, MC150, and 150XP pneumatic nailers

Cons

• Intended exclusively for pneumatic framing nailers, not air rifles or pistols
• Completely incompatible with Umarex UX Trevox break-barrel pellet mechanisms

4

AOLS Stainless Steel Cylinder C Type for AEG Gearbox

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  9.6
• Brand
  AOLS

Key specs1

Cylinder Dimensions

This stainless steel C-type cylinder measures 2.99 inches in length and 1.02 inches in outer diameter. It is calibrated for 301 mm to 400 mm airsoft inner barrels and will not fit the chamber dimensions of a break-barrel pellet pistol.

Pros & cons32

Pros

• Stainless steel body features a treated exterior for long-term wear resistance
• Polished inner bore minimizes friction against internal AEG piston seals
• Ported compression volume optimized for 301 mm to 400 mm inner barrel lengths

Cons

• Engineered for electric airsoft rifles and incompatible with pellet air pistols
• Measures roughly 2.99 inches long, which does not match pellet gun chambers

5

8 Gram/ 12 Gram CO2 Cartridges for Paintball - CO2

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  9.0
• Brand
  CXWXC

Key specs1

Power Source Verification

These 12-gram unthreaded CO2 capsules supply power for gas-piercing airguns and paintball markers. Because the Umarex UX Trevox is a break-barrel air pistol powered by an internal cocking gas piston, it cannot accept or utilize external CO2 cartridges.

Pros & cons42

Pros

• Filled with pure carbon dioxide gas free from unrefined oils and lubricants
• Unthreaded neck design allows standard push-in installation for piercing valves
• Provides consistent gas pressure for 20 to 30 shots per 12-gram capsule
• Sturdy steel casing provides a reliable seal in compatible CO2 airguns

Cons

• Will not power the Umarex UX Trevox, which uses a cocking gas ram instead of CO2
• Rapid firing leads to CO2 cooldown and transient velocity drops in CO2 guns

6

CHEEKON Reinforced Piston with 14 Full Steel Teeth

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  8.2
• Brand
  CHEEKON

Key specs1

Gear Rack Specifications

Featuring 14 full steel teeth seated in a nylon polymer body, this piston is engineered to cycle against an AEG motor-driven gear set. It lacks the internal gas charge and dimensions needed to operate a break-barrel pellet pistol.

Pros & cons32

Pros

• Combines a lightweight nylon polymer body with a full rack of 14 steel teeth
• Full metal rack improves durability against high-stress gearbox sector gears
• Drop-in compatibility with Tokyo Marui, Matrix, and standard AEG gearboxes

Cons

• Made exclusively for electric airsoft gearboxes and will not fit air pistols
• Lacks the sealed nitrogen strut body required by the Umarex UX Trevox

7

CHEEKON SHS Reinforced Piston with 13.5 Steel Teeth (Blue-2, 13.5

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  8.0
• Brand
  CHEEKON

Key specs1

Gearbox Timing Design

The 13.5 steel tooth profile is specifically tailored to adjust the angle of engagement in Tokyo Marui and Matrix spec airsoft gearboxes. It cannot be adapted to mechanical break-barrel pellet air pistols.

Pros & cons32

Pros

• Nylon polymer frame keeps moving weight low inside electric gearbox setups
• Features a 13.5-tooth steel rack designed to optimize gear engagement angle
• Reinforced tooth rack resists wear during high-cycle airsoft operation

Cons

• Incompatible with pellet-firing break-barrel mechanisms like the Trevox
• Half-tooth pickup design is specific to airsoft sector gear timing

8

AOLS Piston Head Aluminum Precision CNC Machined - Black

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  8.0
• Brand
  AOLS

Key specs1

Airsoft Component Sizing

Built with CNC-machined aluminum and internal ball bearings, this component fits Version 2 and 3 airsoft electric gearboxes. It measures 0.92 by 0.60 inches and cannot replace break-barrel piston seals.

Pros & cons32

Pros

• CNC-machined aluminum construction with a durable black anodized finish
• Integrated ball bearing reduces spring bind during high-speed gearbox cycles
• Compact 0.92 by 0.60 inch profile fits Version 2 and Version 3 airsoft boxes

Cons

• Does not fit break-barrel compression tubes or airgun piston rods
• Designed for low-pressure 6mm airsoft cylinder systems only

9

AOLS Reinforced Piston with 7 Steel Teeth

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  7.2
• Brand
  AOLS

Key specs1

Spring Rating Threshold

Up to M140 spring power in AEG gearboxes

Pros & cons32

Pros

• Fiber-reinforced polymer construction handles spring tensions rated up to M140
• Partial rack of 7 steel teeth suited for specific gear ratio configurations
• Standard 2.64-inch length fits Tokyo Marui and Matrix electric gearboxes

Cons

• Engineered strictly for electric airsoft guns, not break-barrel pellet pistols
• Cannot generate pressure inside a break-barrel compression tube

10

AOLS Aluminum Piston with 14 Full Steel Teeth

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  6.8
• Brand
  AOLS

Key specs1

Piston Shell Material

Constructed from hard-anodized aluminum with 14 steel teeth, this piston body provides high rigidity for electric airsoft gearboxes. It measures 2.64 inches long by 0.83 inches wide and is completely incompatible with break-barrel pellet airguns.

Pros & cons32

Pros

• Hard-anodized aluminum body offers rigid structural strength under load
• Full rack of 14 steel teeth provides heavy-duty engagement against sector gears
• Compact 2.64-inch length matches Tokyo Marui and Matrix gearbox dimensions

Cons

• Will not fit or function inside the Umarex UX Trevox break-barrel system
• Adds metallic reciprocating mass compared to polymer airsoft pistons

Last update on 2026-10-08 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Will an AEG airsoft piston fit my Umarex UX Trevox break barrel?

No. The Umarex UX Trevox is a break-barrel pellet pistol, whereas AEG pistons like the GoldenBall SHS 15-tooth or CHEEKON reinforced 14-tooth and 13.5-tooth models are engineered exclusively for electric airsoft gearboxes. These components use nylon polymer or aluminum bodies fitted with steel teeth to mesh with motor gears, which cannot interface with a single-shot break-barrel cocking linkage. Installing an electric airsoft piston will leave your air pistol completely inoperable and can mar the compression chamber.

Does the Umarex UX Trevox run on CO2 cartridges or an internal gas piston?

The Umarex UX Trevox operates on an internal sealed gas ram rather than disposable cartridges. While steel 12 gram CO2 cartridges filled with pure carbon dioxide gas supply power for certain practice pistols, break-barrel gas pistons rely entirely on a self-contained pressurized cylinder compressed during manual cocking. The Trevox has no piercing pin or valve assembly for 8g or 12g gas cylinders. For shooters interested in cartridge-powered designs, reviewing the CO2 BB gun options for training and plinking shows how those valve systems differ from break-barrel actions.

Can a pneumatic tool driver assembly replace a break-barrel gas piston?

No. Industrial driver assemblies like the Phyxlyn 888-588 (part number PH-ANA53) are manufactured strictly for fastener tools such as the NR38AK, MC150, and 150XP nailers. While built with aerospace grade #2024 aluminum and heat-treated 6150 tool steel rated at Rockwell hardness 50-52, these parts are shaped to strike nails rather than generate air pressure for .177 caliber pellets. Inserting a nail gun driver into an airgun chamber will cause immediate mechanical damage.

Will aftermarket AEG cylinders or piston heads seal the Trevox compression chamber?

No, airsoft gearbox parts cannot seal or pressurize a break-barrel pellet gun. Components such as the AOLS stainless steel Type C cylinder (part number A3-CLD-C) measuring 2.99212 inches in length or the AOLS aluminum mushroom piston head (model A3-PHD-MR) measuring 0.94488 inches wide are made solely for motorized airsoft setups. Break-barrel pellet airguns operate under much higher compression loads, requiring exact factory seals matched to the pistol bore rather than anodized aluminum airsoft heads.

What is the difference between a toothed piston rack and an airgun gas ram?

A toothed rack is designed to be pulled back by rotating gears inside a motorized gearbox, while an airgun gas ram is an enclosed, pressurized nitrogen strut. Products like the AOLS blue reinforced piston with 7 steel teeth (model A3-PST-P15H) and the AOLS aluminum piston with 14 full steel teeth (model A3-PST-A14) measure 2.63779 inches long and feature longitudinal gear rails. Break-barrel airguns use smooth, non-toothed piston rods driven by manual barrel leverage, meaning a toothed rack will not fit or latch.

How do I verify internal component compatibility before ordering Trevox repair parts?

Always verify the exact part numbers, powerplant classification, and ammunition caliber in the manufacturer schematics before ordering. Confirm that the replacement listing explicitly states compatibility with break-barrel pellet systems rather than electric airsoft gearboxes or pneumatic shop equipment. If you also maintain larger platforms for field use, reading about the build of a tactical air rifle for pest control and training can help you distinguish between different airgun powerplants and seal styles.