M733 Disassembly

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This video demonstrates the body breakdown and disassembly for a Tokyo Marui M733. This video could also be used as a generic guide for most M4, M16 and other Armalite models.

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70 Comments


  1. Just a helpful tip on reshims. There are no exact guide to a reshiming. Unlike what other sites tell you Shims depend on many variables, version of the mech box, gear brand, brand bushings, brand of mechbox shell, brand of shims. so please do not use those “guides” I know from personal experience. It is based on trial and error and eyes.
    Also Great Job Mechbox.com/6mm Love the new site!

    by Young June 22nd, 2008

  2. Young, thanks for that comment! Absolutely true, the challenge with shimming are the infinite variables of parts, manufacturers and make/model of the AEG. Trial and hopefully no error is what I aim for. Using tips like closing the mechbox case and checking the movement of the gears really minimizes the chance of putting it all together only to find it doesn’t work at all. Good comment, thanks again!

    by 6mm June 22nd, 2008

  3. Hello mechbox/6mm. I assume that all armalite airsoft guns are designed the same for selector switches. I have a dilemma with my M4A1 ICS. I recently disassembled the gun and did it correctly and all. The problem is that I cannot access the Selector Switch screw because I cannot find anything small enough. Do you know any tools that could access the selector switch? I really wished the manufacturers sold tools that they used to build the replicas ): .

    http://i190.photobucket.com/albums/z234/Twister026x/DSC08337-1.jpg

    (Picture of lower receiver selector switch)

    by Twister026 June 22nd, 2008

  4. Twister026, what you need is an offset or right angle screwdriver. Craftsman (Sears) carries them, as I’m sure other parts/tools stores likely do. Try this link: http://www.sears.com/shc/s/p_10153_12605_00941315000P?keyword=9-41315&sLevel=0

    by 6mm June 23rd, 2008

  5. Hi, I have a question!Could you make a video on how to disassemble/reasemble the d-boys m4a1 full metal.

    by boris June 30th, 2008

  6. My gearbox is jammed (I think) what could I do to fix this!!

    by Chris July 1st, 2008

  7. Will this disassembly work with an Echo 1 614?

    by Sean July 6th, 2008

  8. can you guys show me how to remove the outer barrel and also the inner barrel from the hop up

    by Nick July 19th, 2008

  9. This is a very helpful video. But can you guys also do a full stock M16.
    I myself have a Echo 1 M16 DMR, but any M16 would be great.

    Thanks,

    Dave aka *LT*KillaEagle91592

    by Dave July 22nd, 2008

  10. Nick, you should check out this link, its full guide on the m4 hop-up

    http://www.airsoftretreat.com/reviews/showproduct.php?product=118

    by Zeke July 22nd, 2008

  11. my piston on my Classic Army M15A4 is stripped so I ordered a new one how do I put he new one in?

    by David August 4th, 2008

  12. Ok, I am having a problem with removing the pin that is above the trigger. I keep pushing on the pin and it won’t budge

    by Mitch August 5th, 2008

  13. disassemble/reasemble the d-boys m4a1 full metal? It would really help me out… thx

    by MaT August 11th, 2008

  14. Nice video! It was very useful to disassemble my jg m4! It would be great that you do a tutorial on how doing custom battery packs!

    by john August 13th, 2008

  15. I have a question. May you post a video of the disassembly of the A&K SPR mod M4?

    by Chris August 15th, 2008

  16. You guys are lifesavers!

    This is by far the #1 place to get mechbox info!

    I’ve linked to your site over and over because you are hands down the best in this venue!

    Regards,

    Konrad

    by Konrad September 14th, 2008

  17. I have a stock CA m15a4 tactical carbine, if i want to put a 9.6 battery in it would you suggest replacing any other parts to go with it?

    by cirrith September 30th, 2008

  18. I used this video to disassemble my Marui M4 RIS model, but I can’t get the mechbox out, my mag catch button has no screw on it! What gives?

    by Logan October 6th, 2008

  19. i need video of how dissarm barrel pieces of Classic Army Compact Seal please

    by kerbero October 8th, 2008

  20. Hi!
    This is very helpful, but i have a question on how to remove the inner stock inner barrel and replace it with a tight bore barrel??

    Tnx!!

    by Matej October 13th, 2008

  21. Is there anyway you can make a totorial of how to install a metal one piece hop up unit.

    Thank You or if there is a place to find it please email me at tyboyg11@sbcglobal.net

    by Flyboy7200 October 23rd, 2008

  22. Agreed with Flyboy7200. If you have a tutorial on adding a metal hop up to the M4 clones that come with the two piece plastic hop ups stock, that would be great!

    Nice work on the others!

    by mcgski November 6th, 2008

  23. Hi is there anyone who can tell me, what i could do against frequent jams with my m4?
    It all started 5 days after the purchase.
    Battery is ok, as well as the wires.
    Its a BOYI (BI-3681M)

    by LD November 27th, 2008

  24. how do you remove the outer barrel??

    by ledd December 24th, 2008

  25. Hi,
    How would you remove the front end of the gun if it is an S-System?

    by samm December 29th, 2008

  26. are there any steps i can skip/not do , if all i want to do is remove the gearbox for an upgrade

    PS thanks 6mm great and helpful vids

    by Tom Bianchi January 9th, 2009

  27. Will these steps work on a classic army m15a4?

    by Mike January 17th, 2009

  28. I have pretty much the same question as Matej, is there a vid. that shows how to remove the iner barrel and put in a tight bore?

    Kevin
    AKA,
    Silent_Killer_34

    by Kevin January 19th, 2009

  29. Hey,
    I have a KWA M4A1, and I was trying to take apart my gun and remove the gearbox, however, the retaining pin above the trigger will not come out. I’ve tried just about everything, every other part has been removed, but for some reason that pin just wont come out. Any help or suggestions would be greatly appreciated. Thanks.

    by Connor January 20th, 2009

  30. @ Connor, sometimes it does require a punch and a hammer to get those pins out. Be careful to select the correct diameter punch and not to hammer your thumb or the side of the AEG body!

    by 6mm January 20th, 2009

  31. how would you disassemble a DBoys M4 CQB SD rifle since it has a metal silencer with an RIS system and not a handguard like the Tokyo Marui. please help. thank you.

    by dylan January 26th, 2009

  32. hi, i have a CA M15A4 sportline and my fuse keeps on blowing, my full auto went out, and now in a couple of shots it blows a fuse. does anyone know whats wrong with it. thanks

    by Ethan January 27th, 2009

  33. Would this takedown be valid for the KWA m4 also? Thanks alot.

    by Matt January 28th, 2009

  34. Hi, I’ve got a friend that pulled his m4 apart. It doesn’t work anymore. He took the anti-reversal latch out, would that cause the gears to lock up? thanks

    by Theo February 1st, 2009

  35. hey, my gun broke and i want to know how to replace a sperg gear (I think that is what it is called) and I want to know how to replace it. Thanks

    by Frank February 2nd, 2009

  36. Does the G&G series disassemble the same way as the gun in this video?

    by David T. March 3rd, 2009

  37. hi.. can you make a tutorial for m4a1 disassembly including the mech box.. thank you and more power

    by Rhodkie March 4th, 2009

  38. is this similar to JG HK416?

    Good job guys!

    by arvid March 5th, 2009

  39. The BOYI BI Models have almost the same procedure as how to disassemble up to the gearbox (uses V2 Gearbox, by the way).
    1. Some BI have no butt stock cover.
    2. The Magazine Catch can be removed by removing the small latch above the trigger first, then push the Magazine Catch Button all the way in and unscrew the Latch on the other side.
    3. The BI models have no Hop Up Guide.
    4. Removing the front pin (with locking screw) ONLY can separate the barrel side from the gear side by sliding the gear side.
    5. To remove the Butt Stock Rail, unscrew a locking bolt inside the tube using a long screwdriver. This screw is connected to the Spring Guide.
    6. Remove the small pin above the trigger using a small punch or allen wrench AND a rear pin (with a locking Screw) before removing the whole GearBox. (Assuming the motor and the handle are already removed)
    7. The V2 MechBox disassembly video applies when dismantling the gearbox.

    In general the disassembly shown in this video is practically applicable to any M4 and M16 variants with just a few, minor differences.

    Keep up the good work, 6mm. Produce more video demonstrations.

    by Long Ranger 99 March 10th, 2009

  40. i have the old model marui m4 and i want to open the mech box but i can’t even separate the upper and lower receiver, i already took off the receiver pins, i’m afraid to force it coz’ it’s plastic. anyone?

    by juner March 10th, 2009

  41. Hi, I have removed everything that this video shows to remove in order to get the gear box out of the gun’s body but for some reason I cannot get the gear box out of the gun. I can move the gear box around but it just wont come out. I dont know if theres anything specific to classic army bodies that make its dissasembly unique. The gun I bought is called the CA M15A4 CQB to be more specific. The battery is wired to the back but I cannot see how this might affect anything. Thanks for any help or answers.

    by Michael March 30th, 2009

  42. Howdy folks at Mechbox.com! I have been having some trouble Dissembling my new AGM M4A1 Carbine’s upper and Lower reciever. It is extremly stiff, and i cannot pull them apart. Is AGM’s model supposed to be opened in this way? If so i will pull even harder, i just dont want to damage my new gun. Thanks!

    by Brian Plant March 30th, 2009

  43. Hello folks here at Mechbox.com. I have one question to shoot out if anyone would be willing to answer it. I now own AGM’s (Airsoft Gun Manufactors) M4A1 Carbine, with the hetal Body. Dissembling the Upper and lower reciever on this weapon is extremely stiff, and im not sure if removing the rear screw in the stock bar(My M4 has the LE stock) to seperate them. Any tips i would appriciate. Thanks Folks!

    by Brian March 31st, 2009

  44. Hello folks here at Mechbox.com. I have one question to shoot out if anyone would be willing to answer it. I now own AGM’s (Airsoft Gun Manufactors) M4A1 Carbine, with the hetal Body. Dissembling the Upper and lower reciever on this weapon is extremely stiff, and im not sure if removing the rear screw in the stock bar(My M4 has the LE stock) to seperate them. Any tips i would appriciate. Thanks Folks!

    by Brian March 31st, 2009

  45. Heowdy folks at Mechbox! Got a quick question. Does this disessembly work for AGM’s M4A1 carbine? Because when i pop out the receiver pin, pulling the two ends apart are extremely stiff, and i have yet to open it.

    by Brian April 4th, 2009

  46. I have the AGM M4A1 Carbine. I want to seperate the upper and lower reciever, but when i pop out the receiver pin and try to pull them apart i cant. Its like the two are gorilla glued. Are there more steps involved or do i just have to pull even harder?

    by Brian April 5th, 2009

  47. Just to say thank you for the guide, made stripping down my ICS M4 and fixing my selector switch problem a doddle!

    Thanks!

    by Skully April 5th, 2009

  48. The retaining pin (above the trigger) on my KWA m4 just does not want to come out, any suggestons? Thanks

    by Matt April 7th, 2009

  49. hi,
    i have a Colt M4 R.I.S and i want to change the selector plate. Does anyone of you can explain me very detailed how to disassemble and re-assemble your selector plate ?( it only shoots semi-auto because of the german regalement, and here it doesnt matter )

    by Carl May 7th, 2009

  50. Have you seen the video http://www.mechbox.com/m4m16/rewiring-version-2-mechbox.html – This will show you how to remove everything inside the mechbox including the selector plate.

    by 6mm May 7th, 2009

  51. thanks,
    6mm

    by Carl May 8th, 2009

  52. Dear 6mm, if i upgrade my stock mechbox on my JG M4 S S system enhanced version from a m120 spring to a m130 spring will the stock piston be able to take the extra effort of the spring?

    by Tanner May 13th, 2009

  53. Hi Tanner!
    I thought I’d help you out on the decision some.
    Definitely get an upgraded piston if your piston is not made out of polycarbonate. Your stock piston may last a while, but an upgraded one should be used for much greater life.
    CHEAPER ONES- G&P Polyacetal and Guarder pistons are both amazing. They are your absolute best bet for durability and quality for a cheaper price.
    MORE EXPENSIVE- If you want to spend more money, get the SuperCore piston (the best piston on earth), the G&G Co- alloy nano piston (very nice), or the Deep Fire titanium- toothed piston. The Systema black piston also looks nice (do not go for the red one!). The Angel clear polycarbonate pistons are also awesome!
    Do not get an aluminum piston or full metal one. Potentially, shavings from the piston can cause problems.
    R7

    by R7 May 15th, 2009

  54. Will these steps work on a VFC 416?

    by Mike May 16th, 2009

  55. Thank you R7, how reliable are the echo 1 polycarbonate pistons if you know?

    by Tanner May 20th, 2009

  56. Hey Tanner!
    To tell the truth, I have no idea. If you can, look at reviews (such as Airsoft GI). I trust that Echo 1 wouldn’t release lemon pistons. After all, it’s an upgrade from plastic to polycarbonate.
    R7

    by R7 May 31st, 2009

  57. thanks for making this video! i used it to take apart my JG HK416 with crane stock! i was practicing for when my metal body comes!

    by Travis June 22nd, 2009

  58. Thanks for this! Very, very helpful. To get the gearbox out I had to trim away some of the plastic on the back part of the lower receiver though. Other than that it was a piece of cake.

    by scott July 16th, 2009

  59. Thank you so much for this guide! For anyone that is curious, the JG M series disassemble in this way as well. I love your videos, they have saved me a lot of time and probably money as well. The only thing you guys are missing is how to put in new parts for an M4 and how to install a Tightbore barrel, throw those two up and your videos will be perfect! Keep doing what you are doing!

    by Brendan July 23rd, 2009

  60. How do you disassemble a dboys m4?

    by 123haby August 8th, 2009

  61. To whom it may benefit be careful with some metal bodys they slide apart instead of prying them then to the guy with the 614 JG good luck with the metal body upgrade they dont have one that lines up the rails yet. hope this clears up some ?’s. Also would like to see front end dissasembly of a JG 614 / 416, Thank you Mechbox .com

    by Skathe August 21st, 2009

  62. Im getting a G&G gr16 carbine soon. Is there anyway to replace the spring (upgrading to a m120) without removing the grip and motor?

    by G&g gr16 October 1st, 2009

  63. can you change the spring in a G&g gr16 without removing the motor and the pistol grip or do you have to remove them?

    by G&g gr16 October 1st, 2009

  64. Can you do a disassembly of the 2009 dboys boyi m4 s system?

    by mj October 16th, 2009

  65. hey will this work with the JG m733?

    by mean boy October 21st, 2009

  66. But their training in doing a daily radio show with no script in front of them and no producer talking in their earpiece makes them naturals for TV. ,

    by Mark95 October 22nd, 2009

  67. what do i do if the magazine release buttons screw is stripped?

    by airsoft November 26th, 2009

  68. will some of this work with the G&G GR-16 BlowBack?

    by zach hull December 6th, 2009

  69. Im looking to install a full metal body on my marui m733, this video explained almost everything i was looking to find out. I do have a question, when you remove the gearbox from the lower reciever how then do you remove the wireing from the upper reciever so you can dissgard both parts?

    by Max December 16th, 2009

  70. Hi. Im looking at swapping the Body over on My JG M733. Have you any times or a video on removing the Barrel?
    Many Thanks

    by Phil January 7th, 2010