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SA OBLIVION 18:1 Precision Gear Set with Improved Timing | ANAREUS View larger

SA OBLIVION 18:1 Precision Steel Gear Set with Improved Timing

Specna Arms OBLIVION 18:1 gears made of durable 40Cr steel are a upgrade gear set for AEG gearboxes. The gears feature modified sector gear timing to reduce PME in high-speed builds, high hardness of individual components and a versatile 18:1 gear ratio suitable for both standard and high-stress setups.

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  • Black
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  • Black
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For more than 25 years, we know what you like about airsoft.

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: Specna Arms

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OBLIVION steel gears with modified timing

This expert product description was prepared by the ANAREUS.cz expert team. All rights to this unique content are bound to the anareus.cz domain.The OBLIVION series from Specna Arms was designed for players and service technicians who expect high mechanical durability, precise manufacturing and reliable operation from an AEG gear train. The gears are made of durable 40Cr chromium steel, with individual components heat-treated to hardness levels corresponding to their respective loads. This version uses a versatile 18:1 gear ratio, providing a good balance between cycle speed, motor load and overall reliability. The key feature of OBLIVION is its modified sector gear timing. The cam controlling the tappet plate has been shifted to the area of the second tooth, which improves nozzle movement timing and helps reduce the risk of PME at high RoF. This solution is particularly beneficial in builds with powerful high-speed and brushless motors. Specna Arms also places great emphasis on manufacturing quality control, making OBLIVION an interesting choice for both routine servicing and more powerful, high-speed AEG builds.

Key features of Specna Arms OBLIVION gears

18:1 gear ratio

A versatile gear ratio offering a good balance between cycle speed, motor load and reliability.

Modified timing

The repositioned tappet plate control cam optimises nozzle movement and helps reduce PME in high-speed builds.

40Cr steel

Strong chromium steel and heat-treated components provide high resistance to mechanical stress and wear.

For powerful motors

Also suitable for high-speed AEG builds with powerful high-torque or modern brushless motors.

High hardness

The gears reach a hardness of up to HRC 50, while their highly stressed shafts reach HRC 55–60.

Specna Arms OBLIVION steel gearsANAREUS recommends

When replacing gears, do not forget proper shimming and lubrication. Even a high-quality gear set requires precisely adjusted meshing between the individual gears.

Technical specifications

  • Series: OBLIVION
  • Designed for: AEG gearboxes
  • Gear ratio: 18:1
  • Material: 40Cr steel
  • Timing: Modified sector gear timing
  • Sector gear hardness: HRC 42–50
  • Spur gear hardness: HRC 42–50
  • Bevel gear hardness: HRC 42–47
  • Gear shaft hardness: HRC 55–60
  • Weight: 69 g
  • Colour: Black

Package contents

  • Specna Arms OBLIVION 18:1 steel gear set

Frequently asked questions from our store

How does the modified timing of OBLIVION gears work?

The cam on the sector gear controlling the tappet plate has been shifted to the area of the second tooth. This changes the timing of the tappet plate and nozzle movement and reduces the risk of PME during very fast gearbox cycling. This is particularly beneficial in builds with very powerful motors.

Are OBLIVION gears suitable for brushless motors?

Yes, the modified timing was designed with powerful and brushless motors in mind. However, the entire setup must always be properly matched – motor, gear ratio, spring, battery and ETU, if fitted. Simply installing higher-quality gears does not guarantee correct operation of an improperly configured upgrade build.

Do new gears need to be shimmed and lubricated?

Yes. After installation, the gears must be properly shimmed, their axial play and mutual meshing checked, and then a suitable lubricant applied. For gears, we recommend PTFE or ceramic grease. Incorrect shimming can increase noise and drivetrain resistance and significantly shorten the service life of both the gears and bearings.

Variants18:1
ColorBlack
Body/receiver materialMetal