Mechbox.com | Airsoft repair and upgrades

41 Comments

I have a question regarding a problem with the gearbox of the
mp5 models. If the gun could only fire fully automatic, even on semi, is there a way i could fix it?
by C July 2nd, 2008


Yes. The problem typically has to do with the selector plate or trigger electrical components – but it can be repaired.
by 6mm July 2nd, 2008


This brings back so many painful memories of my mp5 days. I think the hardest part is getting the lower receiver screws in without a magnetic screwdriver.
anyway, thanks for both the disassembly and the reassembly.
they’ve helped me quite a bit.
by Taylor Hill July 3rd, 2008


where can I get silicone gell? (or silicon)I’ve tried harbor freight, home depot, the local hardware store, west marine and wall-mart. everyone gives me the same “what the?” look, and then tries to sell me sealant, not lube. Please help.
by jakedixon August 12th, 2008


TO JACK DIXON TRY YOU LOCAL HOBBY STORE,
by MAURICE August 24th, 2008


Can you make some videos of installing tightbore barrels to some of the guns, such as mp5, m4, and g36c?
by Austin Lewis September 1st, 2008


Hi, I found this website by accident and I’m glad I did, I just would like to know is the disassembly and reassembly the same for a JG? I have two one has a ris system and the other is an SD6. Both gearboxes are v2. I appreciate all answers and opinions, because I am on a team and this would realy help out
by mike September 12th, 2008


Wow guys, AWESOME guide. I just successfully disassembled the gun, lubed the mechbox, and reassembled the gun on my TM MP5A4. Even with the slight difference, your guide was very straight forward and I was able to do it despite NEVER having taken this gun apart before. Thanks so much!
by Chip Foarde September 21st, 2008


First off, I have a (not so stock anymore) UTG MP5. I recently upgraded the gearbox to a slightly more powerful set, but I’m having an issue now. (With the battery charged/plugged in, of course) When I pull the trigger on any of the firing modes, i can feel the motor click, but then stop, and it does not fire, nor does the gearbox mak any sound. I have checked the gear mesh between the motor and the box, and all is well. Any ideas?
by Caelen September 25th, 2008


need a reassembly vid for a mp7
by ryanhallahan October 13th, 2008


I disassembled my working mp5a5 then put it back together, but after I was all done it didnt fire at all. What do you think I did?
by Yuuta Sumioka October 16th, 2008


hi mechbox.com i have an mp5 a5 ras rail made by echo 1 and victer arms and i was wondering how to get a motor back in the gun
by Rhonda Bergman October 22nd, 2008


This works with JG Mp5A4 except you do not have the nut with the hop up fall out.
by Sam October 24th, 2008


Is it possible to replace the Mechbox in the MP5-J with a mechbox from an MP5k? I believe the J has a Version 2, and the k has a Version 3. I wanted to buy a possibly broken MP5J and replace the internals with my k version (minus the inner barrel and what not), because my k versions body is getting a little worn out and old. Please let me know if its possible or if I am just an idiot for coming up with the idea.
by Phil November 7th, 2008


its a newbie question is JG and Marui identical inside and out?
by Xavis December 27th, 2008


I installed an upgraded spring (Prometheus MS110 SP) on my TM MP5J. Stock battery (8.4 volt battery) won’t fire the gun more than 20 shots. Is this normal?
by Al December 30th, 2008


Maybe a video on the Echo 1/Galaxy/TM mp5k?
by Alex February 6th, 2009


Can you make a video on the MP7?
by jeremy March 2nd, 2009


i have a question regarding the motor, i shot it and the motor got hot, so how could i fix this problem.
by derek dimaggio March 20th, 2009


Hi Al,
If the gun just locks up and makes a clicking noise (or used to but stopped), then that means that either your battery is too weak or overcharged, someone did a bad job on shimming, or the motor is a bad one and almost dead.
If all these are done correctly, then the gun should work.
PS- If you used to hear a clicking noise, and don’t anymore, then your fuse has blown. Replace it, look for a higher power battery, and fire the aeg to decompress the spring. If the mechbox still won’t fire, examine the motor and reshim. However, you have to decompress that spring before opening the mechbox case or else- explode! So, just use a paperclip and make a hook on one end. Then, tug on the anti reversal latch through the pinion gear hole until the piston is making contact with the cylinder head (spring is decompressed).
R7
by R7 April 13th, 2009


Hiya 6mm, I was attempting to install a CA M4 V2 mechbox in my ICS Mp5, I’m noticing its very difficult to install in the handgrip (Where the selector and tigger is housed).
Why is that? Is there a major difference thats keeping me from installing correctly?
by Wunder April 16th, 2009


Hi i was just wondering if you could break down the ICS MP5A4 like this. I was also wanting to get a collapsible stock so i wanted to rewire the gun to take the battery in the foregrip. Is this possible with the ICS MP5A4?
by steven sickler May 3rd, 2009


The ICS MP5 is loads easier to disassemble. You basically just pull the pins and slide the lower receiver out. Rewiring is exactly the same as on the video we did for the V2 box.
by 6mm May 6th, 2009


hi,
i havew an mp5 sd5
i have one huge problem that is really bugging me,
my hop-up does not work on my gun the lever is not changing anyhting, does anyone ahve any suggestions.
by sam May 10th, 2009


Hi sam!
Is your bucking in your hop unit?
Is the nub in place so that the hop arm pushes it down into the bucking?
Do you see the bucking being pushed down through the barrel if you turn the hop up unit to more hop?
R7
by R7 May 15th, 2009


i have stripped mine all the way down to the “marker” portion just the grip and the gears but how do i get to the geras it seems like the grip and trigger come off but i dont know how to get it off
Erik
by erik May 17th, 2009


is there a disassembly video on here for this gun
by erik May 17th, 2009


Excellent tutorial.
Can you do one with a barrel upgrade for the MP5?
by Josh May 31st, 2009


I need to know how to reset my gearbox, because every time i press trigger it makes clicking sounds, the gun is only a week old. I heard that on top of the gearbox there is a hole were you can insert a pin in, and it will reset. If that is true, is there a way you can remove the little top part the one after the rear sight, the one you can kind of push in. My battery is charged and connection works, my mag is feeding, my trigger is working. IF anyone got an answer email me at dankal1230@yahoo.com
by Daniel June 10th, 2009


what’s wrong with my mp5? i followed the steps but at the end my gun wont even fire, i think something in the gearbox. somebody help!!!!!!!!!!!!!!!!
by Kuri June 13th, 2009


Thanks for the vid my mp5 is a cyma but it is the exact same. I needed to do some tuning inside the gear box because my gun was shooting to hot for the field I play at so I got into the gearbox and clipped a few coils on the spring and put it back together unfortunatly I didn’t really know what went where so I guessed and it didnt fire. so if you guys could make a video of the inside of the gearbox and where every thing goes that would be great.
My email is jjsairsoftmn@gmail.com
Jordan
Frozen Ops
JJ’s Airsoft
by JJ's Airsoft August 4th, 2009


I recently used these guides to fix a minor electrical issue, but I may have caused a larger one. My gun has started shooting inconsistently. It will fire a couple times weakly and not fire at all, randomly. I think is has something to do with the hop-up, but I’m not sure. I found that I was missing a screw and bought a new one, this helped but did not solve my problem. It was sold to me as a Echo 1, but I was told that it was not. What could be wrong?
by TNT August 8th, 2009


hello, i recently discovered that my JG-MP5A4 shoots full auto even when clicked into semi auto…its very annoying and i was wondering how i could fix it…thanks
by braden August 25th, 2009


Hello, I completed the reassembly and the only problem I am having is that after I take one shot on semi auto, the gun locks up requiring me to switch to safety and then back in order to fire the gun again. Why is this?
by Moop September 25th, 2009


i agree with austin lewis you should do a break down of the hop up unit and the barrel assemblyn. or how to install a tightbore barrel
by zach September 29th, 2009


if i have an MP5 gear box, can i the option to change its selector to a m4 style one,so that i can put the gear box onto an m4?is this possible mate?pls help,and what will be needed to change to do this mod.thanks
by Peter October 8th, 2009


Hi, I have a SD version of this weapon and was wondering if there is anything fundamentally different in the reassembling?
by Erik October 27th, 2009


Hi, i am not the first to ask but i really need to know, is this the same for a JG mp5? if not what are the differences????
by HaydenPutre November 6th, 2009


why is the video not working???? i have a Mp5 on the table in pieces, and i need to know how to get a small black piece back into the rifle.
by Alex November 7th, 2009


egnore my previous comment, its working now….finally
by Alex November 7th, 2009


to Peter, I would say you could do it as there an M4 and Mp5 both have the same V2 Gearbox so the only thing i would see to be changed would bw the selector switch, the selector switch rod and/or the selector plate. Experiment for the best fit and length.
by Tanner November 30th, 2009