Contact Us Tel:(626) 286-0360 Store Locations
Phone Support M-F 7am-5pm PST
Browse by Type or Category
FREE SHIPPING for orders over $129! New deals released hourly and daily. See Deals Here!

Echo1 Complete 8mm Metal Gearbox for M4 / M16 Series Airsoft AEG Rifles (Wiring: Rear)

ID: 86199 (GB-E1-M4-8mm)
ECHO1 / JAG859188861992ECHO M4 MB 8MM86199
5.0 stars, based on 3 reviews
Echo1 Complete 8mm Metal Gearbox for M4 / M16 Series Airsoft AEG Rifles (Wiring: Rear)
Hover or touch above to zoom
Product image 1 Product image 2 Product image 3 Product image 4


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.
Wiring Options:


  • High strength metal alloy gearbox shell
  • 8mm steel bushings
  • Polycarbonate air nozzle, tappet plate, and piston
  • Steel cylinder
  • Wired to rear
  • Factory direct OEM replacement part
Compatibility: For Echo1 and Other Compatible M4 / M16 / TM Ver.2 Series Airsoft AEG Rifles
Material: Metal Alloy, Polycarbonate, Steel

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.

3 Customer Reviews

(Write a review)

by Gage C. on 11/02/2020
"Will this work with my scar
by Jay Jay P. on 04/10/2020
"Holy crap. This thing works a miracle WITHOUT upgrades. I slapped this into my gun and holy crap. This was nuts. Of course I've done some minor upgrades like new gears for more torque and a stronger spring, other than that, its all original. Amazing gearbox.
by Zachary B. on 06/26/2019
"Great drop in part, especially with it being the steel gears, 8mm bearings, it came with a different non ported cylinder than my original, have yet to test it out on the course, but other than that was a straightforward easy install.

Comments & Community

Discuss about Echo1 Complete 8mm Metal Gearbox for M4 / M16 Series Airsoft AEG Rifles (Wiring: Rear) with your friends and fellow shoppers!

Have an urgent question about this item? Contact us, our resident experts are standing by to answer your questions!

California Proposition 65 Warning: Cancer and Reproductive Harm -

Customers who bought this also purchased

Parts and accessories may not be compatible with the product displayed on this page. For compatible parts/accessories, see the You May Also Need section and please verify details on the product description page.

Search tags for related products