Mechbox.com | Airsoft repair and upgrades

87 Comments

Nice video, but i still cant get my gun to work..
So i was noticed a little trigger sticking and delayed reaction in the trigger and today it just stopped working. So i took it apart and i noticed that the motor does twitch when the wires are attached but thats all i get? Help me out please
by Travis Friend June 23rd, 2008


Travis: Check your trigger contacts and make sure they aren’t burn and make sure they’re touching. Also, make sure you have a charged battery.
by Taylor Hill July 3rd, 2008


Can u make a disassembly and reassembly of the Tokyo marui mp5-sd5? I want to upgrade it but its my first gun and i dont want to mess it up.
by Chris July 15th, 2008


Chris – We would be glad to! We just don’t have a TM SD5 on hand to video. Contact your favorite retailer and ask them to send one to us!
by 6mm July 15th, 2008


Hello there! Is this video similar to the MP5K version? or can you make a video for the Tokyo Marui MP5K?
Thanks!
by Glenn July 16th, 2008


Do you have to remove the gearbox in order to remove the hop-up and inner barrel? Is there anything else that needs to be done in order to remove the hop-up and inner barrel?
~Matt
by Matt July 16th, 2008


Matt, for the TM versions of the MP5, you do have to split the case to get the hopup/barrel assembly out of the gun
by 6mm July 16th, 2008


Travis take the motor out by itself and see if it turns. If it twitches like you said I would check the wiring from the battery to the motor. Check the fuse as well as the motor connections; they might be broken off partially.
by Matt July 20th, 2008


6mm, is opening and mp5k the same as this? Or will you guys make another video on how to get the gearbox out? That’d be great if you guys do make a new video though. Thanks!
by Glenn July 23rd, 2008


is this like the same for the mp5 a4 ris?
by taylor July 24th, 2008


So will this work with the galaxy mp5k? i need to get into the motor to change the metal bushings will i be able to use this video or do i have to figure it out?
by david July 27th, 2008


My friend’s E1 MP5 will not stop firing even on semi auto. Once you pull the trigger it fires by itself regardless on what mode. (the safe works though)
do you think the trigger contacts are busted? Or maybe something with the internal trigger mechanism?
thanks guys
by Connor August 12th, 2008


Hello Connor,
Check the tiny spring on the contact things…i dont have any idea what its called…but its right under the tappet plate near the sector gear…that tiny spring pulls back the contacts for the wiring if it doesn’t pull back, there may be tiny obstructions or the tiny spring is cut…by the way, have you opened it? or did that just happen? Hope this helps!
by Glenn August 13th, 2008


it just happened lol
I guess I’ll help them open it up. Hopefully it’s not a demon gearbox like my E1 G36C (the tappet plate was making the gears lean lol had to take it in because it was too hard for me)
thanks Glenn
by Connor August 18th, 2008


Hey guys,
I have an Echo 1 Mp5-J, and I was wondering whether or or not it’s possible to add the burst fire selection, like on the TM models. I appreciate your video very much, too.
Blake
by Blake September 7th, 2008


My JG MP5 also did the same thing recently. Hopefully this guide will help me disassemble it and I can fix the problem.
by Tim September 9th, 2008


i. hate. this. gun’s. assembly.
by jake September 11th, 2008


Would be great if you could put the mp5 sd5(JG) one up as its slightly different when you get the chance. I have a new barrel for mp5 and i just dont know how to get to it.
by Simon September 17th, 2008


I have TM MP5 and when I pull trigger all I hear is a loud screeching sound. Could this be a bad mechbox?
by Roy October 14th, 2008


I disassembled my mp5a5 then put it back together, but after i finished assembling it, it won’t work/fire. Is there something i might have done while disassembling or assembling? plz help
by Yuuta Sumioka October 16th, 2008


Hi guys,
thank you very much for your interesting and up to date website.
I learned a lot from your website, it is the best technical site about airsoft maintenance in the whole web.
Keep on with the good work !
greetings from Italy
Efarel
by Efarel October 18th, 2008


how do i get to the hop up of my mp5?
by Felipe October 20th, 2008


can you make a video on how to rewire the mp5a4 so the battery is held in the foregrip instead of the stock? i dont understand how to do it.
by mitch October 23rd, 2008


hi. i have a galaxy pdw. do i need to take the gun apart to change the barrel? kindly advise. thanks
by john October 25th, 2008


John- yes i believe you do. Roy- it’s probably your motor. Try adjusting it.
by Blake November 21st, 2008


Hey, I have a Vector Arms Mp5a4 will the instructions in this video work to take it apart? Thanks
by Theo December 7th, 2008


Hey guys at Mechbox.com
I’m a team tech and everytime I rewatch your videos, I learn a little bit more. I’ve pretty much memorized them all. When you guys start doing pistols let me know. My team has been having alot of pistol problems.
Thanks
Robert
by Robert December 22nd, 2008


hi there mechbox.com how can i upgrade my mp5 rapid firing and how can i my fps turn into 400 to 450?
by lucky boy December 28th, 2008


can you please show how to replace a barrel
by Decoursey Beach January 1st, 2009


@ lucky boy – High FPS and ROF is a very challenging task which usually ends up with a very temperamental and unreliable AEG. Be prepared to spend literally hundreds of dollars/euros/whatever to make a super-AEG.
by 6mm January 3rd, 2009


can you make a video about the tokyo marui mp5k dis/reassembly?
by igy January 7th, 2009


hey guys im stuck and really stuck,
i have the tm mp5 a4(full stock) is it possible and cheap
to rewire it so that i can have a collapsable stock but be able to have the option to turn it into the full stock versian relatively quickly, please help, please send suggestions or instrustions to camsotheraddy@hotmail.co.uk
thanks guys
by Cam January 17th, 2009


can you guys make a video for the extra steps on taking apart a Vector Arms Mp5 RIS. Thanks
by tnapp January 23rd, 2009


hey Tnapp, there are three screws holding the RIS on the gun. There should be a big phillips head screw on the bottom rail, loosen it by twisting it two or three times. After that there are two other screws on each side of the RIS near the hop-up adjustment lever; take both of the screws out. Then near the front sight there will be a hex head bolt (2.5mm or 2.0mm, I can’t remember which) take that out. After that you should be able to pull the RIS off, BUT BE CAREFUL! the outer barrel is made of plastic unlike the body of the gun, you can scratch and damage it easily. When you need to put back together put in the bolt near the front then the other two screws, after that tighten the big screw on the bottom again. If you tighten the big screw first it will be really hard to get the RIS on.
by Joe February 12th, 2009


Can you make a video on how to disassemble-reassemble the MP7
by jeremy February 22nd, 2009


Great video! Will the same basic steps used in takeing apart a Galaxy MP5K PDW?
by Jeff B February 28th, 2009


Hey guys! This video is great and really helped me when I had to disassemble my Mp5 for the first time. Now, I want to do a basic spring upgrade similar to the one in your V2 spring upgrade video. However, I have a TM Mp5A4 and was wondering how this will differ when I try to remove it from the Mp5 body. I assume the wires are in different places? Any and all help is appreciated!
by Chip March 2nd, 2009


Hey, nice vid its really helped
but is there any chance of making a barrel removal video for TM MP5?
I really need to look at my hopup but i dont wanna risk breaking anything
by Rob March 15th, 2009


I have an ICS MP5 SD3, how do i remove the inner barrel so that i can install my new tightbore barrel?
Thanks
by Julian March 17th, 2009


Hi, I bought a used gun with an extended barrel put in (TM MP5 SD5) and need to figure out how to put in the shorter barrel it came with or I’m just going to saw it off. If you can advise on how to switch them out that would be really helpful. Thanks!
by Brendan March 25th, 2009


could you please do a video on how to unlock a jg mp5 sd5 mechbox
by rudy robles March 25th, 2009


I have a Well R5 MP5A5 and it will only shoot fully automatic no matter what position the selector switch is in. I realize this question has already been asked on here but the selector switch on mine will make a clicking sound when it is switched to semi, but not when its switched to automatic. Could this be do to a misalignment or maybe something busted. I haven’t opened the shell or done anything to it just new outta the box. Only a week old too. The clicking sound may be normal but it worried me a bit.
by Josh April 6th, 2009


I tried to dissemble my mp5 but the motor is stuck in the handle. It will not release or slide out. What could be causing this!
by Josh April 7th, 2009


Hey! The part with the whole forestock dissasembly thing, could you remove your barrel from right there to change out the barrel to a tightbore? Can anyone help me with that?
by Patrick B. April 18th, 2009


hey i have this same gun and when the motor is in the gun it wont fire at all but when motor is no load spinning it runs fine any suggestions?
please email me @ redrampage@cfl.rr.com
by Zach April 20th, 2009


i am looking to take my mp5sd5 apart
will it be pretty much the same as this?
by sam April 26th, 2009


Hey Josh!
Try pulling the motor out hard with some pliers. If it is still in the handgrip with the plate on it, you mapy want to tap the handgrip plate at the base of the motor. This will release the tension.
R7
by R7 May 2nd, 2009


i have a g&g pm5a4 it will not shoot fully auto matic but it will shoot semi while full auto is selected however the trigger does not want to be pulled it was working fine just all of a sudden it stopped what could be the cause? thanks
by Kyle May 7th, 2009


Most likely your safety lever is in the way or any combination of the selector plate / cutoff lever problems. You’ll have to open it up to really find out.
by 6mm May 7th, 2009


Just a heads up to all the Low End MP5 Owners (AKA Crosman Pulse R74)… I just performed this disassembly on my sons R-74. I disassembled the gun as the gearbox would not drive, like something was broke/jammed inside. The disassembly was identical with the exception that the motor wires were soldered in place.
When I pulled the drive motor from the hand grip a small 1/4″ round slug (like a small coin) fell out of the hand grip. Was this a makeshift spaced for the motor on the gear side or possibly a piece of left over assembly junk (FOD) from the factory?
The gearbox was a WELLS (I’m assuming it’s a V2 Gearbox.) Other than a bunch of nasty lube everything appears intact except the back plug/seat for the spring… the peg that sits inside the spring broke away from the seat. Possible cause of jamming?
by Steve K May 29th, 2009


Hi Steve,
The metal slug goes on top of the motor (it free floats). There is a small hex screw at the base of the handguard that you can tighten. The hex screw pushes down on the slug which pushes down on the motor for the right gear mesh. Don’t tighten the hex screw to much during assembly or else a grinding gear sound will occur.
Make sure all the springs are in their propper places. Confirm your shimming is not faulty. Make sure the piston head isn’t loose on the piston.
If the gun doesn’t fire, look at the tappet plate/ air nozzle connection.
If the gearbox doesn’t cycle, look at the shimming, make sure the battery isn’t dead, and make sure the motor is working properly.
R7
by R7 May 31st, 2009


Thanks R-7…
The gun still acts as though there is something stuck in the gears/gearbox.
I repaired the factory spring guide by replacing the broken off base with a same size pan washer & screw. I performed the assembly/test rotation of the gears & “though” they were good, but it appears they were not.
As I only have $29.99 invested in this gun (cost & shipping – Overstock Auctions.com) I’m going to get metal bushings, a shim pack, spring guide, new air head & air nozzle… Tear it apart when the parts arrive & give it another go.
Would a M110 Spring be an upgrade on a Wells V.2 Gearbox?… I know everyone is thinking (buy a better gun… but my son & I are having a blast moding/repairing this one.
by Steve K June 4th, 2009


Recently I wanted to get out and use my airsoft gun, I have a JG MP5 RAS, but when I put in the battery and mag. I got nothing. It seems like the gears are seized up, but I looked at the inside of it and it all seemed the way it should be. I don’t have any idea what the problem is. Any suggestions?
by Andrew T June 6th, 2009


hi
I have a mp5 vector arms ris. I cant find a hex key to fit my fire selector. it is extremely small. any advice?
by scarey June 6th, 2009


Hi again, Steve,
What are the symptoms? If you can, ONLY use metal gearboxes!!!!!
If you give me some symptoms, I could probably track down the problem. Any sounds?
R7
by R7 June 8th, 2009


RE to scarey,
i was wondering that too, turns out its a .050 hex, i found one for a buck over at Sears.
by Andrew T June 10th, 2009


Hey R7,
This Wells V2 is metal with nylon bushings. It really doesn’t make any sounds other than-
>you hear the motor try to turn the gearbox, but it won’t… like something has been wedged between 2 of the 3 gears preventing it from spinning the gears.
>> I pull the motor out of the hand grip and it spins like no tomorrow…
>>I placed the shims back in the same positions I found them (maybe not a good idea?) and performed the re-assembly-”dry run”… the gears appeared to rotate okay.
>> the battery has a full charge (8.4v 1100) and will run either of our Pulse R72’s for several hours of play…
…any thoughts? Piston Jamb? Spring guide broken again or off center?
And while I’ve mentioned the Pulse R72… I saw where Wells offers that G-3 with a metal gearbox now. Do you know if that is also a Wells metal V-2?… I’ve yet to crack open the R72’s so do you think a Metal gearbox would be a drop in affair? (I got TWO R-72’s for $22.99 from Overstock Autions… that included shipping!) I’m just thinking ahead for when the plastic gearboxes fail…
Thanks in advance-
Steve
by Steve K June 10th, 2009


please make a review on how to take apart a Vector arms MP5A5! there’s a big piece of plastic connected to the barrel and it’s covering the hop up. i can’t get it off. HELP PLEASE!!!!!!!!!!!!!!!!!
by Kuri June 12th, 2009


hey i have a ca mp5a4 (with a full stock) but need to rewire it to the handguard is the dissasembly similair to the tokyo marui? i’ve never rewired a gun before and am a little afraid to try but with the proper help i think i may be able to do it.
by Luke June 13th, 2009


Hi,
I think I found your problem. I think your motor is in backwards so that it spins the opposite way! When this happens, the motor is pushing the gears against the anti reversal latch! No wonder you gearbox won’t cycle when it has to push against a stationary metal object!!!!
If I were you, I would do a good shim job for increased durability instead of sticking with stock shimming.
Please tell me if installing the motor the other way fixes the problem!
R7
by R7 June 13th, 2009


My mp5a4 is not shooting. The motor works very well except when its it the gearbox it doesn’t do anything, if somebody could help that would be great.
by mike June 17th, 2009


Is it the same with the JG model?
by Thomas June 24th, 2009


Hi,
turn the motor around in the handgrip and try again (switch it around so that front is facing back).
R7
by R7 June 24th, 2009


Can you make one using the jg mp5 ras a5? I have been told it is a replica of the tokyo mauri mp5 ras model. I want to upgrade my gun soon but be confident that i know what i am doing and have less of a chance of breaking something on accident.
by Dan June 25th, 2009


Hey how about a guide for a Full stock MP5 prefferably the MP5A4 due to the fact it was a pain in the @$$ to get there wiring in and out. Also any way to get your hands upon a Systema FTK, Gearbox kit or Revolution gearbox kit and show us how to install one of those in a Ver 2. GB?
by Jack July 3rd, 2009


Hi, i recentley bought a Cyma.023 MP5 and i’m pretty happy with it but it doesnt shoot hrd enough. I know its a beginner gun but is there and upgrades for it and if, my reqest is to do a video about it. Thanks.
by Cereal July 5th, 2009


Hi, i have a question, about my mp5j. On the selector switch, the screw is not a phillips head. it’s this wierd looking, sort of star shaped thing.I’m not sure what it is, and i dont know how to remove it. help would be very appreciated. thanks.
by Austin July 21st, 2009


Austin:
From your description, its a “Torx” screw.
Two waysI can think of to remove it are:
1 ) Get the right size Torx driver (recommended).
2 ) Find a flat bladed screwdriver that can fit into opposite cuts in the star and turn ( will work, but could damage the screw).
by TJ August 4th, 2009


I would like to know how to properly remove the inner barrel and hop up so i can put in a tight bore barrel
Thanks
by Cody August 6th, 2009


hello , my jg mp5 ras fixstock has a problem , it`s stuck on safe, even if a put it on semi or full auto it stays on safe , i can`t pres the triger…. any solutions?
by naiky August 9th, 2009


hey guys, first off i want to say that this is the first time i have dissasembled an airsoft gun, this is the best website i have seen.
wonderin though, i opened my mp5 up (utg navy seal version) and am wonderin what the best upgrade is for less than $75, i was going between tightbore barrel or gears and spring, any suggestions?
by charlie August 25th, 2009


my jg mp5-a4 wont shoot semi auto it only fires full auto, even when switched into semi auto…how can i fix it? and whats wrong
by braden August 27th, 2009


Can you post a video on how to open the Jing Jong MP5 Navy ? Thank you
by Alexandre August 28th, 2009


Hey guys,
Just wanted to know if this video is an adequate guide to taking the TM MP5K apart?
Thanks
by Rob August 29th, 2009


i was wondering if i have to do all this just to remove the barrel from my mp5 or if there is another way to remove the barrel without going through all this trouble….
by dotskie August 30th, 2009


hey I have a tokyo marui mp5 sd6 and when I pull the trigger it doesn’t shoot, but the trigger goes all the way back as if it were shooting. I tried to unjam the gun, and I got a bb out, but I think the only reason the bb jammed is because the gun didn’t shoot it (obviously). I recharged the battery last night and put it in today and it’s still not working. I was thinking about taking the gun apart but this looks pretty complicated and I’ll probably lose a part lol. Any suggestions?
by Brian September 7th, 2009


[...] [...]
by JG M5-J jammed and the cleaning rod broke? September 7th, 2009


Hi, my gun doesnt seem to be shooting straight. Not even close actually. It keeps shooting towards its far left side. Is my barrel bent or something? U’ve only had it for about a day and its already messed up and my warrenty is already void since i took off the orange tip.
by Kelvin Yeung October 6th, 2009


hey
My MP5J trigger will not fire when in SEMI mode, trigger is locked always. But in Full AUTO its OK, what’s the remedy guru?
thanx
by jon November 1st, 2009


I was wondering what kind of battery upgrade i could put in this gun without hurting it.
by Sam November 7th, 2009


[...] an idea. There is an online tutorial. Let me get you a link (MP5s take forever to take apart). Mechbox.com | Airsoft repair and upgrades Blog Archive MP5J Disassembly This is an MP5J, so it might be a little different.__________________"I like my bologna like [...]
by Field Strip November 29th, 2009


[...] Date: Sep 2009Location: CaliforniaPosts: 586Blog Entries: 1 Mechbox.com | Airsoft repair and upgrades Blog Archive MP5J Disassembly Although that disassembly guide is for a MP5J, if you do not have a MP5J it should be very similar [...]
by Classic Army B&T Mp5 SD3...thoughts? December 1st, 2009


I just recieved my cyma .023 and the fire selector switch keeps popping off its track. I carefully opened it up and found there to be nothing broken or missing. I then reassembled it and the selector worked…once! I need to know if there is any way to fix this issue. thanks
by mike b December 1st, 2009


MP5-J
so I’ve broken (too much action..) the Cocking Lever(MP-39), which has snapped off,
the Reinforced Cocking Bolt(MP-54) part that the Cocking Lever attaches to, seems to have disappeared to the front end and i’m not sure whether it’s MP-53 or MP-54 part that is still movable; the ‘tube’ seen from the side,
so I want to ask whether I have to split the receiver to access and (try to..) fix the inner parts of the Cocking Receiver (MP-52N)
there is the part in the video where you loosen the Cocking Receiver (05:05), but not take it off entirely, I think that’s the inner part I need access to,
buy myself a replacement Cocking Lever and perhaps Cocking Bolt (??) too, then place them in,
this is a great video anyway, thanks for showing how intricate the inside is to work(!!)
.vic
by vic December 17th, 2009


How do i take off the orange piece at the end of the barrell?
by Alex December 17th, 2009


as im planning to replace my gun with a solid stock and remove the siding stock, do i need the “slide locks” ?
by Lee December 29th, 2009


as im planning to replace my gun with a solid stock and remove the sliding stock, do i need the “slide locks” ?
by Lee December 29th, 2009