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AGM Complete 7mm Ball Bearing Gearbox for M4 / M16 Series Airsoft AEG Rifles

ID: 44619 (GB-AGM-GBM4)
GB-AGM-GBM4 / GB-M4 rear wire
AGM859188446199GB-AGM-GBM4 / GB-M4 rear wire44619
2.0 stars, based on 3 reviews
AGM Complete 7mm Ball Bearing Gearbox for M4 / M16 Series Airsoft AEG Rifles
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  • Complete, Direct Drop-in Gearbox
  • High Strength Metal Alloy Shell
  • Aluminum Spring Guide
  • Ported Cylinder
  • Accommodates Ambidextrous Selector Switches (sold separately)
  • 7mm Ball Bearings
Compatibility: For Tokyo Marui, Matrix, G&P, JG and other compatible M4 / M16 Series Airsoft AEG Rifles
Material: Metal Alloy

Manufacturer: AGM

3 Customer Reviews

(Write a review)

by Christopher N. on 04/22/2015
"Bought this as a replacement for a cheap Black OPS Viper M4 I got at Wal-Mart after the trigger stop broke. Here's how I feel about it...

-Stiff spring (isn't listed here or on package, guessing about M120)
-Well built, heavy, made almost entirely of metal
-Long air nozzle (sand or shave it if you need it shorter)
-Easy to disassemble and reassemble (compared to other GBs)
-Stiff/solid feeling trigger pull
-Seems to have a decent rate of fire with stock motor

-Flimsy connectors on motor wires (mine needed to be bent at 90 degree angle, and when I attempted to bend it a little it snapped off. Had to splice in a spare off old GB)
-Rear wiring harness (to battery) is a bit shorter than I would have liked it to be.
-Selector plate is not fully compatible with all guns. Had to swap mine off the old gearbox.

-The holes for the retainer pins to the upper/lower receiver and to the trigger assemly don't quite line up so well. This COULD possibly be due to the fact that my receiver is made of ABS and is not as rigid or uniform as steel.

Overall 4 stars. I love it. :)
by John K. on 04/28/2016
"Bought it as replacement for the original one I had installed in my agm m16A4, worst gearbox I've ever owned, I've been airsofting for 6 years, didn't expect much from this but I did expect it to work at least. Literally poop right out of the box!
by John K. on 03/17/2016
"I'm an avid airsofter and have been for over 5 years now, this is honestly the w
orst gearbox I've ever purchased. Poor air seal, fire rate seems like the battery is always about to die ( even with a new battery), save your money.

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