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Home » Airsoft Accessories, Attachments & Parts » AEG Internal Parts » Gearbox » Version 2.5 / SR25 Series

Retro Arms CZ CNC 8mm Gearbox Shell for SR25 Series Airsoft AEG Rifles

ID: 58972 (GB-Retro-6391)
6391
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Retro Arms

$155.00

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Description

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Product Description

Features

  • Precision machined from 7075 T6 billet aluminum
  • Durable anodized finish
  • Reinforcement in key stress points to counter rapid wear from high performance parts
  • Pre-radiused cylinder windows - helps evenly distribute impact force
  • Deeper wire channels along base of gearbox
  • Includes heavy-duty, metal ball-bearing spring guide
Unlike most other gearbox shells on the market, the Retro Arms CZ gearbox shells are precision CNC machined out of a solid block of billet 7075 T6 aluminum giving them unmatched durability and resilience. Combined with reinforcement of key stress points and stainless steel connecting bolts, the gearbox shell has undergone extensive stress tests with M160 springs without any signs of wear.

Compatibility: For A&K, Classic Army, Tokyo Marui and other compatible SR25 gearboxes
Material: CNC Billet 7075 T6 Aluminum

Manufacturer: Retro Arms CZ

Disclaimer: Please use discretion when installing custom parts as fit and compatibility may vary. Some modification may be required. Professional installation recommended.

1 Customer Review

(Write a review)

by Matthew F. on 10/25/2021
"Works well in my A&K SR25 with a slight modification: the curved part of the back of the lower receiver had to be slightly filed so the gearbox could lower all the way into it. The bushing holes are also extremely tight, to the point that I had to use a (non-marring) pin punch to get them seated properly. The gearbox came with screws and a ball-bearing spring guide.

Additionally, considerations must be made for several components:
- the thickened front of the gearbox requires a longer nozzle, an AUG-length nozzle fit my build perfectly
- the gearbox requires a thinner cylinder; the stock A&K cylinder was too wide

My GATE aster also dropped right in, I just had to dremel away the bump on the other side of the gearbox for the sticker.

Overall 4/5 stars, removing 1 star for being slightly off-spec.

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Retro Arms