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Echo1 Complete 8mm Metal Gearbox Shell for M4 / M16 Series Airsoft AEG Rifles

ID: 86200 (GB-E1-M4-Shell-8mm)
ECHO1 / JAG859188862005ECHO M4 MB 8MM SHELL86200
3.5 stars, based on 2 reviews
Echo1 Complete 8mm Metal Gearbox Shell for M4 / M16 Series Airsoft AEG Rifles
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MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.


  • High strength metal alloy gearbox shell
  • Accepts 8mm bushings
  • Factory direct OEM replacement part
Compatibility: For Echo1 and Other Compatible M4 / M16 / TM Ver.2 Series Airsoft AEG Rifles
Material: Metal Alloy

Manufacturer: Echo1

About ECHO1 / JAG

Since its inception the Echo1USA brand has strived to provide our clients with uncompromising quality of products and customer service. As avid Airsoft players ourselves, we are able to understand the needs of the sport and the frustration with inferior products. Our commitment to yielding the finest most affordable Airsoft Guns and Accessories on the market today is steadfast, and remains the foundation of our continued success.

2 Customer Reviews

(Write a review)

by Connor Y. on 08/26/2021
"I was hesitant to purchase due to how cheap the price was, however, the quality of this gearbox is great! I purchased for my Polarstar Kythera. The downside was that inside the gearbox, there are slots for gears to fit in (I assume for better stability) and significant dremeling is needed for the HPA hose to fit.

This product comes with the gearbox shell and screws ONLY. No other internals, selector plate, trigger, etc are included.

I gave this item a 4/5 due to the dremeling required for what I needed. Photos of the inside of the shell would’ve saved a lot of headache, had I known.
by Brett H. on 11/25/2021
"I bought 2 of these and they both cracked at the front. Granted this was before I did any radius work so take it with a grain of salt but both were not high stress at all, just shooting 360 fps at around 11 rps cause I mainly used a 7.4. Not a reliable shell in my opinion.

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