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Heckler&Koch MP5 (Working)
A model of the MP5 submachine gun. It shoots LEGO pins in semi-automatic mode and also ejects spent cartridges(black tubes). The magazine holds 14 rounds. Model also features working cocking mechanism, extendable stock and fire selector.
About this creation
Sooooo... this is my latest model, the Heckler&Koch MP5 submachine gun! You might say I am a little obsessed with H&K weapons, as this is already my third model of one... :)



Anyways, this weapon uses a spring to shoot 2 stud long technic pins, which are inserted in round tubes (the cartridge), just as in my previous 2 models. These cartridges are stacked in a curved magazine, just like the real thing. The capacity of the magazine is 14 rounds. (more than in my previous model because I used a few white tubes instead of the usual black ones :p).

The gun is semi-automatic, which means only a pull of the trigger is required to fire a round and the next round is pushed into the chamber afterwards, after the empty casing is ejected. The maximum range of the weapon is about 20-25 feet (when shot at an angle when standing). The mechanism used is almost identical to the mechanism in my previous models, so if you want more pictures/information, go look there.

The model also features a extendable/retractable stock, working cocking mechanism and fire selector.

Concerning the shape, due to my lack of (inverted) roof bricks, the curves on the weapon don't really look well, but you'll have to excuse me for that. I tried to make it look as realistic as possible and I think it turned out rather well

As I am quite busy studying at the moment, I will not make anymore pictures in the nearby future, sorry... and as usual I'm not doing instructions so please don't ask. (I know you really want them :p )

Please review and let me know what you think, so I can improve this model!


Left side


Stock extended


Right side


The MP5 lying on the ground.


Magazine and bullets. Unfortunately,the magazine is quite fragile... it WILL fall apart if touched in the wrong way. The bullets (tube and pin) do actually look a little like the real 9mm round as they are quite comparable in size.


This is where the magazine is put in.


Magazine loaded and fed into the weapon.


Breech. You can see the cartridge in there.


Front sight - I thought a tire imitated the real sight best.


Rear sight



Aiming down the sight (well, aiming... pushing the barrel against the floor can't really be called aiming ;) )


Grip


Fire Selector. The selector thingie can rotate, but apart from that it doesn't do anything.


Stock. It can slide in and out of the gun on those little 1 stud wide beams.


Stock extended. The stock is prevented from falling out the back by these 1 1/2 stud pins.


The stock, when extended, is locked in place by this holed plate. The corner of the plate fits nicely into one of the notches in the stock, so the stock won't move. I got this idea from MjrDisasters MP5 , so credit to him.


The cocking handle! This thing is so much fun :) It is actually just a ball on two technic axles put in a L-shape with a rubberband attached to it, so it can only slide forwards and backwards.


You can pull it back and let it go, which makes the handle fly forward and make a "clack" sound. The handle also fits into the little nook, so you can slap it down and it will also fly forward.


Well, the following will be an explanation of the mechanism (sort of). This is the back of the weapon. You can see the part with the spring onto the yellow axle thingie. The spring is attached to the piece behind it with some thin iron wire. Anyways, this piece moves forward when the trigger is pulled and when the trigger is released it will be pulled back by the rubberband.


When the trigger is pulled, the spring is pushed through this hole and into the back of the cartridge in front of it.


The cartridge and bullet (when fed into the weapon) are pushed against the sloped piece (upside down in this picture)


While the bullet (technic 2 stud pin) CAN move through the inverted roof bricks, the cartridge (black tube) cannot move anywhere because its diameter is a little larger than the pin's.




Anyways, this is how it works. When a magazine is inserted, a round is pushed into the chamber. When the trigger is pulled, the spring is pushed forward into the cartridge. Because the pin is somewhat "stuck" inside the tube, the spring compresses itself. (in fact, the gun can only shoot bullets that cannot be pulled out of said tubes with ease, because otherwise they would just fall out when the trigger is just slightly pressed)


When the spring is compressed enough (and has built up enough energy) the "stuck" pin will be shot out of the tube. The pin actually flies pretty far because of the long spring.


Afterwards, the spring is pulled back by the rubberband. Then the empty tube (casing) is pushed out of the breech by the round below, along the sloped piece (the tube can now move sideways because there is no pin blocking this movement anymore, since it was shot out). This makes it look just like the real thing.
Now, as said before, a new round (the one beneath the pushed-out tube) is chambered and you can fire the weapon again by pulling the trigger once more!


And a last view of the MP5.

Well, I hope you liked it! Please leave a review if you did (or if you didn't, so I know what to improve :) )

In response to the questions asked below:

The spring I used in this model was taken out of a mini toy gun that shoots little red balls, I don't think springs this size can be found in pens. In some of my previous models however I did use pen springs, they work fine too, although they have less power. The spring I use:
uncompressed = 4,2 cm (1,68 inch) / compressed = about 1,4 cm (0,56 inch) / diameter = 0,4 cm (0,16 inch)
The yellow axle thingie is just slightly longer than the spring itself (4,3 cm or 1,71 inch) I cut this one to size, because I could not get a proper result with the standard part. Sadly I don't know which set it came with... but I recently made step-by-step "instructions" (just a LOT of pictures :P)



Comments

 I like it 
  August 1, 2014
how does it work?
 I like it 
  April 8, 2012
It works incredibly well! Superb job!
 I like it 
  February 28, 2012
Great original mechanism design!
 I like it 
  August 17, 2011
i love how realistic it looks, and the entire thing is great, when you mentioned that the clip is fragile, have you tried putting just a dab of super glue on those main parts, just a little goes a long way when holding legos together
 I like it 
  June 11, 2011
Awesome!!! I've made a few lego guns none semi auto also it would be cool if you could somehow fit a small lego moter into a gun and make it automatic
 I like it 
  June 7, 2011
Can't find the words, love the youtube! 6/5!
 I like it 
  March 14, 2011
Excelent is not enough to call this piece of art. Very well done my friend
 I like it 
  November 27, 2010
It's hard to type while drooling.
 I like it 
  August 27, 2010
If you want this mp5's instruction, go to this page: http://www.mocpages.com/moc.php/65373
Thomas Cooper
 I like it 
Danien Berends
  August 26, 2010
cool
 I like it 
  August 23, 2010
Wow!
Thomas Cooper
 I like it 
Ben Rose
  August 22, 2010
My mind has been thoroughly blown. That is amazing.
 I like it 
  August 22, 2010
that's the best moc i've seen in ages - awesome!
 I like it 
  August 22, 2010
I love the fact that it actully shoots!!! 6/5
 I like it 
  August 22, 2010
Two of my favorite subjects; guns and Lego!
 I like it 
  August 22, 2010
nice! congrats on moc of the day!
 I like it 
  August 22, 2010
I love it it looks great the magacine is terriffig and the deatal great. I have seen many MP5`s on MOCpages and this is one of the best. Nice Jop.
  August 22, 2010
this gun is too kool to make instructions for
 I like it 
  August 22, 2010
Wow I really like it! You know, I have that gun for Airsoft.
 I like it 
  August 22, 2010
Now that is true work!
 I like it 
  August 22, 2010
That mechanism is just ingenious. I just don't get the thing with the rubber band though, could you maybe make a pic that shows how it is attached and how it pulls back the spring?
 I like it 
  August 22, 2010
Wow. Its hard to believe that it shoots, but it does and im amazed.
 I like it 
  August 22, 2010
send my instructions please
 I like it 
  August 22, 2010
Incredible!!! Congrats on MOTD!! well worth all the time to build it. I still cant believe it shoots. -John
Thomas Cooper
 I like it 
Tiger Bush
  August 5, 2010
wow!this by far one of the best models i have ever seen!keep up the good work. would u mind checking out my models and giving me some tips on my models?
 I like it 
  February 17, 2010
Your gun is just awesome, but it takes a lot building hours i'm finisht with the back part and almost with te magazine but it already shoots, but i had to be creative with the round tubes, i have none, zo I build my own one. It shoots awesome thx for this great gun
 I like it 
  December 12, 2009
i got a few " cartride rods " on a very old (small) snowspeeder
 I like it 
  November 9, 2009
I made it and its just amazing! i used a long lego rod thing for the tube, i just glued it, and i used a pen spring and it worked! i just glued the spring at the end closest to the bolt. it jams a little, but thats the bullets problem! thanks alot!
 I like it 
  October 27, 2009
Works extremely well by the looks of it, great design! 5/5!
  July 30, 2009
Where did you buy this spring,because i made your MP5 but i cant shoot because i havent good spring
 I like it 
  July 26, 2009
very clever mech, you just inspired me to think outside the box a little more (im the mech designer on my gun replica team). Thanks for the inspiration thumbs up :D
 I like it 
  June 24, 2009
could you just tell us the pieces you need in a chart because i dont have the pieces and i want to build it! Anyways great moc and you should make more!
Thomas Cooper
 I like it 
Joris Hoekman
  June 22, 2009
jEez man thx for the instructions Awesome lol i am almost finisht building but my bullet not always shoot but doesnt matter Thanks a lot!
Thomas Cooper
 I like it 
Joris Hoekman
  June 22, 2009
jEez man thx for the instructions Awesome lol i am almost finisht building but my bullet not always shoot but doesnt matter Thanks a lot!
 I like it 
  June 21, 2009
this is the best moc othe site! but could you make it on lego digital designer
  June 15, 2009
from what lego set is those cartige rods from?
 I like it 
  June 9, 2009
amazing
  June 2, 2009
Great Gun, Great Design. You could probably find a circular piece off a specialized set. Problem, I believe it is in an old space shuttle version set (its also in white). Do you have an LDD I could have? Your instructions are very blurred and I often couldn't tell what some of the parts are. By the by there are elongated pen springs that do have quite amount of power. I think some hardware stores even sell high strength springs.
 I like it 
  April 23, 2009
I can't get my eyes off the screen!
  April 20, 2009
Quoting Milan Cmadge 1 more thing how did you put a movie on. I need to put one on and I can't. Please reply.
When you uploaded a video to Youtube, you can see the description right? Well, somewhere there you will find the URL. Below the URL is a spot that says: "embed". Copy those intire code and put this on the page you're making. Hope it helps.
Thomas Cooper
 I like it 
Zak Gillies
  April 12, 2009
these are awesome you should start a buisness your way better than brickgun!!! can you please make an LDD model of it (without the spring of course)!!!
Thomas Cooper
 I like it 
Andrei Rozhin
  February 1, 2009
WHERE DID YOU GET THE TUBE FOR THE AMMO?????
Thomas Cooper
 I like it 
Callum King-Underwood
  January 3, 2009
You say the rounds are quite comparable in size. I don't see how you work that out as they are approximately 5mmx15mm by my reckoning rather than 9mmx19mm of the actual round. Otherwise this is one of the best models I have seen. Time for me to modify the mechanism into my own gun.
 I like it 
  December 29, 2008
I've looked at all of your guns and they are the best I have seen. They are visually aesthetic and they work! Kudos to you!
 I like it 
  December 5, 2008
This is the best mechanism I've seen on this website ! You are so brilliant ! Can't believe it ! I'll try to fit it into an AK or an M4 Rifle !
 I like it 
  December 1, 2008
this is INSANELY accurate. and why would he make a vid of him building it when its already built? have you ever made instructions as you freehand something? no. you just DONT. it takes too much time, work, and hastle. but yeah. i want one. 5/5 fo sho lol
 I like it 
  November 11, 2008
i am almost finished making revolver with your mechanism it is awesome :D and also i approciate (however you spell it) that you are so unselfish that you made instructions for this awesome gun i love heckler & koch weapons they are the best and please make more instructions for your weapons thanks!!
 I like it 
  October 26, 2008
Man you should make videos on these there so sweet
 I like it 
  October 14, 2008
Real nice thank you for the instructions i`m gonna build it tomorrow (i`m gonna try, looking for the right spring got the blocks) and round the sharp edges if i can. got the blocks i`m gonna put it on my page please give me your opinion and check out my sniper rifle (hints/tips) again Thanks and much respect
 I like it 
  October 10, 2008
u r insanely skilled!! not much more i can say!! keep it up!!
 I like it 
  October 10, 2008
that the most AMAZING lego-weapon I've ever seen! seriously! btw: how long and hard is that spring?
 I like it 
  August 27, 2008
Hey this is an amazing creation!!! I made one and its so clever! 1 more thing how did you put a movie on. I need to put one on and I can't. Please reply.
 I like it 
  July 31, 2008
:(wo) (thats a smiley saying "wo") 10/5!! looks great and is operational
 I like it 
  July 19, 2008
this is so cool and i really like it. can you please send me the instructions. that would be nice!
 I like it 
  June 24, 2008
Quick question: How do you prevent the spring from flying out with the pin? Do you wrap it around the stick or do you not modify the spring at all? I'm looking into making a working revolver with a similar mechanism. Hopefully I'll have all functioning parts. Thanks
 I like it 
  June 15, 2008
omfg cool mechanism,i try to make one too. plz plz plz plz make a uzi smg for my. check my page.
 I like it 
  June 3, 2008
I Can't Understand why this is 4 and a half stars, cause this thing is downright AMAZING!!!!!!!!!!! Anyway Check out my lowclass nonfiring AK-47...
 I like it 
  June 3, 2008
WOw this is amazing i love all your creations please send instructions
 I like it 
  May 26, 2008
I'd say this is your best creation ever the G36 is good but I like the MP5 I have 3 questions 1. What type of springs did you get from the pens? 2. What is that yellow axel thingy and where did you get it? 3. Why didn't you take apart the MP5 PS. Heckler&Koch weapons are awesome and keep up the good work!
 I like it 
  February 7, 2008
Once again Thomas, a very nice MOC. And don't worry about liking HK firearms, their some of my favorites = ) - Jeff
 I like it 
  February 4, 2008
Working lego firearms! Cool!
 I like it 
  February 4, 2008
please tell me how to make the firing mechanism
 
By Thomas Cooper
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