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GHK M4 / M16 Airsoft AEG to GBB Complete Gearbox Conversion kit with magazine (Version 1)

10 Customer Reviews

by Anthony C. on 05/07/2017
"I have both the V2 and V1 of this kit, and the mags are interchangeable between the two. This kit seriously rocks, I've had it for going on 2 years now and it's been through numerous milsim ops (Ironhorse, Faded Giant 5, Ironhorse 2, Dragon Rogue IV) as well as weekend local play. These are basically set and forget kits, I wanted to see how long it'd last with no maintenance, and I'm approaching 2 years on my original kit (v2) and it performs as good as it did on day one. I like this kit because it supports a vast variety of configurations and will fit in most receivers, the only problem I had was with an APS full metal receiver set that I had to painstakingly file by hand for about an hour, but now it works perfectly. The only drawbacks are: that the bolt carrier is made of zinc so I had one shatter on me in a metal body, and they shoot a little hot (1.5-1.7J) with no way of lowering the fps.

Pros- durable, cheap, FUN, accurate, compatible with tons of parts
Cons- Can't adjust fps, so might shoot too hot for CQB
by Gavin D. on 02/26/2017
"First off, I would like to say how amazing this kit is, despite my negative attitude forward the trigger response. For me, (a golden eagle body) it required absolutely no modification whatsoever. It shoots great, and I love the kick, but the trigger response is terrible when it is stock. There is a big indention on the left side of the lower part of it, and you can run a screw at the bottom of that circle, and it will give it the best trigger response on an airsoft gun you have ever seen, comparable to a Daytona gun. I did this, and with black gas, I can knock holes in a cow skull, but I don't have a crono, so no real measurement. I also have an angel custom "v" sniper bucking, and a 363mm 6.01 inner barrel. I have a 160mm suppresser and a 8.7 inch barrel, and it looks amazing. It also is extremely accurate with my setup, and if you are in front of the gun, it is deafening. I did this(with no bullets in the gun) and I thought gas was leaking to my left because by ears were ringing so loud. I would recommend this to anyone willing to take on a small project of fixing it up, and sometimes maybe not even that. Overall, good buy. I wouldn't even think before I made the decision to buy again for a different gun. It's a no-brainer.
by Lawrence T. on 02/11/2017
"Tricky modifications well worth the effort though. Te peg holding the front of the charging handle had to be ground half way down to let it slide free. As well as the bolt cover had to also be shorter in order for the bolt to go all the way forward and fire correct. I solved one simple mod a day and by the third day I am impressed gas efficient while maintaining a high rate of fire. Get your conversion and say goodbye to gears, i am getting a spare while supplies last.
by Tristan K. on 08/07/2015
"I bought this and put in in my G&G cm16 combat machine. It is really high quality and I only had feeding problems with the first few fills of the magazine. Other than that, no feeding problems since!

Awesome realistic recoil
Perfect assault style fps
Mags last 3-4 fills of bbs with just one fill of gas

Installation required lots of modifications.
Accuracy isn't like the original AEG

Recommended if you want something cool! And gas powered obviously.
by jacob o. on 01/29/2014
"my friend recently ordered this because it was an effective and cheap way to get a gbb
when he got it it came with every thing and the mag but we experienced a problem putting it into his gun. he has a m16 and it will fit the dboys m16 with some modifications. it is designed for the rifle to have a collapsible stock but he had a full stock so the screw wouldnt let the gbb gear box fit properly so we took a bolt cutter and a grinder and shaved it down.
now it works amazing it is pulling about 290 right now which is good considering we chronoed outside here in Virginia and it was about 20 degrees out side.
the mags are solid and dont leak but we suggest even though we havent had a problem to get some moondog orings cause eventually you will need some o rings.

high fps (290 in 20 degrees is really good)
sturdy construction
it has nice recoil similar to a .22

a bit of work to put in a gun but if you have a collapsible stock you should be good
increase in maintenance when switching from electric to gbb whichh is ok
a lot of work to do to get it in the gun and make sure it fires correctly

other than that it is a great upgrade for any aeg m4 style rifle
by Jessica F. on 06/13/2012
"Quite impressive
this thing actually isnt bad. i just got it today,put it in, and tested it out.
i do have to say it is a huge pain to put it ( you have to modify your guns body or the box)
the mag i got with it had a loose o ring but that was an easy fix
once i got working i fell in love. it shoots about 350 with a standard m4 barrel at around 22 rps
it is very gas efficient and has a heavy recoil for what it is (comparable with a 22 rifle)

pros: decent fps and incredible rof
heavy kick
awsome additions to your collection

cons: spare mags are $50 each and you have to order them from asia
kinda a pain to put in

pretty much i think it was worth the money for what it is
by Matthew F. on 04/28/2017
"I give this a 4 because out of ALL the good things about this kit. The only major flaw is how stressful this thing is to install! Although once that's done, you will not regret it. I can easily shoot this over 300ft accurately on a mild windy day!
by Cael B. on 01/06/2017
"I have had this for a few months and i have had some regret buying it. I did not feed very well and it took a lot of fixing. I have been using 20 gram bbs and it has had problems. Then a friend let me use some of his 25s with it and it worked PERFECT! so make sure you keep in mind this will run best with 25s.
One thing that REALLY FREAKING FRUSTRATED me was that it came with did not work so i had to buy a bunch of extras and they were each like 30 dollars.
I recommend this to Airsofters who don't mind high maintenance rifles
by Phillip C. on 03/01/2015
"Doesn't feed very well 75% of the time. I use all the gas in a magazine before I can shoot all the BB's out, simply because the hop up won't accept BB's.
When it works, its great and fun.
by chad a. on 02/11/2015
"Bought this and a we tech aeg metal lower come to find out at least I'm my case that it requires serious modifications no matter what lower you are using a pain to install hope it is more fun to use once it's all installed. Gotta go buy more tools to finish before I can test it.