Complete Gear Box Set for Echo1 A&K Classic Army M249 MK46 Series Airsoft AEG

4.1 stars, based on 9 reviews

$105.00 $86.10

Model: GB-M249-UP

9 Customer Reviews

by Allen T. on 05/29/2015
"I just received mine today and it seemed fine until i inspected it some more.

nothing really

front wired for mine

Air nozzle was cracked

and the micro switch was caught up in the gear set

So yeah im sending mine back.
by Alexander P. on 05/07/2015
"The wires are not even the right length to fit into the stock, the clear part in the photo is under the gear box thats how short it , and it will not fit into the M249 body, its also not the same one in the photo.
by ira a. on 06/15/2014
"For m249 replacement gearbox


1. It has the heavy duty micro switch.

2. Probably the most user friendly gearbox out there.


1. Nozzle was broken due to improper packaging.

2. Shim job on the gears was so tight that each shim was slightly concaved/warped.

3. Spur gear was warped.

This gearbox is easy to work on. After polishing the interior, swapping new spur gear with the old one and properly shimming, greasing and oiling...the gearbox and gun in general work great...just required some tlc.

Complete Gear Box Set for Echo1 A&K Classic Army M249 MK46 Series Airsoft AEG

Great for spare, replacement, upgrade and more! Having a spare gearbox is essentially having another gun! Pre-upgrad to shoot at 350~400 FPS. Great drop in ready to go gearbox. Spare shell and a spring guide is retailed for $85 alone. Great value offered directly from the origin of the best M249 series AEG out there. (Disclaimer: For experienced players only, due to that we cannot test complete gearboxes before shipping, it is recommended that buyers have gearbox knowledge.)

Complete gearbox includes:
-Gear Set
-Spring set
-Reinforced Cylinder / Piston set
-Metal Spring Guide.
-Switch Assembly
-All the screws
-All the wiring, tappet, and fuse.
-Reinforced Metal gearbox shell.

A great upgrade if you have a old version of the Classic Army M249! Newer design and better performance compare to older technology!
We have compiled a series of videos for AEG take down, assembly and gearbox for your reference. Recommended for experienced players only. A "gearbox" virtually never breaks, offers spare parts for all components. All gearboxes are sold as complete set of parts and "AS IS". All the gearbox are directly from manufacture. Buyer responsible for fine tuning and proper installation. is not responsible for shimming it perfectly or playing the game of airsoft for you.
For more information on complete gearboxes, please visit: Complete AEG Gearbox

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