Small parts, big impact. This section is dedicated to the hidden heroes of every AEG gearbox - the small spare parts that keep the bigger components (gears, pistons, motors) running smoothly. Here you’ll find a clear guide to essential gearbox spares, what each one does, and why replacing or upgrading them ensures reliability and longevity on the field.
Mechanical controllers - levers and contacts
These components act as the gearbox’s nervous system, translating mechanical movement into electrical and functional commands:
- Trigger & trigger trolley: The trigger moves a plastic trolley with metal contacts. When they touch, the circuit closes and powers the motor. With LiPo use, sparks burn the contacts - replacing them restores crisp trigger response.
- Cut-off lever: The part that makes semi-auto possible. As the sector gear rotates, it lifts the lever, pushing the trolley back and cutting the circuit. When worn, the AEG may fire bursts instead of single shots. A reinforced steel lever restores proper semi-auto function.
- Anti-reversal latch: Prevents gears from spinning backward under spring tension. Weak stock latches can snap in strong builds. A hardened steel latch is essential for high-power setups.
Small springs - return force that matters
Beyond the main spring, many tiny springs inside a gearbox control feeding and reset functions:
- Tappet spring: Brings the air nozzle back forward. Weak springs cause misfeeds in high-ROF builds.
- Trigger spring: Resets the trigger after each pull.
- Lever springs: Small springs for the cut-off lever and anti-reversal latch keep them in position.
Replacing all small springs with reinforced or stainless sets during maintenance ensures smooth and reliable operation.
Foundations - guides, shims and screws
Even simple support parts influence gearbox stability:
- Spring guide: Holds the main spring in place. Metal guides with ball bearings prevent twisting and improve consistency.
- Shims: Ultra-thin washers that remove gear play. Proper shimming lowers friction, noise and wear.
- Gearbox screws: Quality steel or Torx-head screws prevent stripping and ensure a secure shell fit.
Other small spares that save a game
- Trigger contacts: Worn contacts cause intermittent fire. Soldered or silver-plated replacements are more durable.
- Roll-pins & small pins: Keep levers and gears aligned. Replace if bent or loose.
- Shim kits & spring packs: Must-have spares for any tech bench.
When and what to replace
- Frequent misfeeds or inconsistent semi-auto? Check the tappet spring and cut-off lever first.
- During a gearbox rebuild with new gears or springs, always replace small springs and the spring guide.
- In high-power builds, upgrade anti-reversal latch and spring guide to reinforced steel versions.
- Keep shims and spare pins handy - they save time and prevent breakdowns mid-game.
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FAQ
Which small spring fails most often?
The tappet spring. In high-ROF setups it wears quickly and causes misfeeds. Replacing it proactively avoids feeding issues.
How do I know if my anti-reversal latch is worn?
If gears spin backward when power is cut or the motor stops in odd positions, the latch may be failing. A steel replacement is recommended for strong builds.
What do shims actually do?
They remove lateral play from gear axles and align gear teeth properly. The result: less noise, less wear and smoother cycling.
TL;DR
Small gearbox parts are vital for reliability. Upgrade anti-reversal latches, cut-off levers, springs, guides and shims to keep your AEG consistent. These small details make the difference between a working replica and a reliable field performer.
USP: Ready-to-ship products
CTA: Choose the essential spares and keep your gearbox in top condition.
