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Semi- & Full-Auto Micro Uzi
Working Semi Auto & Full Auto Micro Uzi Lego Technic Rubber Band Gun
About this creation
Yes, my first so called “MOC” is here.

Here are the vitals:

Functional Lego Rubber Band Gun.

Designed in imitation of the Micro Uzi, though not an accurate replica.

Designed for use with 3 x 80 mm elastic bands.

Semi-automatic mechanism, changed to fully-automatic burst using a fire-selector switch.

10 round ammo capacity.

Quick, easy and secure reloading.

Chunky robust design.


This gun features a modification of one of my favourite mechanisms. It shoots off bands as fast as you can pull the trigger with a nice crisp snapping-action. I formerly (6 years ago) used it in a gun as large as a full-size assault rifle to fire powerful 10 x 200 mm industrial rubber bands. They even had enough power and range to be used, within limits, outdoors. Unlike conventional rubber band guns which fire their bands from a cog with ten or more hooks on it, this mechanism features an 8 x 1 Lego beam which pivots around its centre. A band is hooked on to it and stretched to the front of the gun. The 8 x 1 beam is then rotated backwards by 180 degrees. Because the mechanism is a ratchet, doing this will lock it into place and another rubber band can be hooked and the process is repeated. Pulling the trigger allows the beam to spin 130 degrees in the forward direction and releasing it allows it to turn the remaining 50 and the cycle is complete and ready so start again. Not only does this provide a more secure and solid alternative to the standard mechanism, but it is more convenient to load and there is absolutely no delay between pulling the trigger and the rubber band being discharged. The force on the 8 x 1 beam by all the rubber bands results in the whole firing cycle being satisfyingly crisp.

A venture into new territory for me is the inclusion of a “fire-selector switch”. This basically un-hooks the part of the mechanism that catches the beam immediately after the trigger is pulled, leaving the beam free to push the catch out of the way on each rotation, therefore resulting in a full auto burst. The beam isn’t sufficiently slowed by the catch on each rotation, meaning that the gun will discharge its entire capacity in a very short space of time indeed. I was hoping the fire-rate would be slow enough for the burst to last for a second or two at least. No matter - it will have to be an improvement for future creations. If one rubber band is loaded and the beam is then rotated backwards, as if loading, but without actually hooking on rubber bands, the gun will effectively fire blanks. This is a particularly useful way of testing the mechanics without having to pick up a bunch of rubber bands each time. If a dozen or so “blanks” are loaded and full-auto is selected, the force of only one rubber band on the beam means that it rotates slowly enough for a 10-15 round-per-second submachinegun-like fire rate, which is just great. It’s just a shame that the force of many rubber bands makes the fire rate faster. I was also a little disappointed at the capacity. Try to load more than around ten and the bands do tend to brake. I already reduced the size of the gun to compensate, but don’t want to reduce it further. The other solution is to use bigger rubber bands. Unfortunately this means that they are stretched less and are therefore less powerful, so it’s all a compromise. You could have a weak gun that holds twenty or more. Generally, bigger bands are better because each rotation of the 8 x 1 beam stretches them a relatively smaller proportion of their length. That was the advantage of the large rifles I used to make. For now, I wanted to make a compact gun and the Uzi style suited that. I also wanted to use smaller, weaker bands that would allow experimentation with full auto. I would encourage anyone using this mechanism for themselves to remember that bigger is better. One potential expansion of by current design would be to include a clip-on barrel extension, possible a dummy silencer. This would allow longer rubber bands to be fitted without power loss.

Further random comments in no particular order:

The trigger is easy to reposition. I am aware that it appears a little odd as is. I happen to find a long reach to the trigger more comfortable. The fire selector switch took hours and hours to get right. That whole part of the mechanism moves up and down with each trigger pull, meaning that having the selector level attached directly to the frame of the gun in a more convenient position was infeasible. As it is, it’s not hard to reach. It also snaps upwards with a satisfying click when you flick it with your thumb. The fore and rear sights are purely aesthetic. I had to move them both side ways out of the gun because they interfered with the trajectory of the bands. This is my first attempt to make a gun the least part aesthetic. My future projects may include larger models into which I’ll be able to fit all the mechanics, yet which I’ll be able to attempt to make look as realistic as some of the most admirable replicas here on MOC.

For those who’d like to replicate the mechanism or the entire gun, I have taken a fair number of pictures. If you’d like more detailed instructions post your email address. If I get enough requests, I may get round to stripping the gun right down while taking photos of each step in order to make instructions. What I will do at some point in the near future is to make a similar mechanism, but designed specifically for simplicity and for reproduce-ability. The mechanism shown here in the Uzi is solid and reliable, but is more complicated than it needs to be to include the full-auto mode and also in order to fit it into a small space. I plan to make one that is simple and far easier to copy. So watch this space.

Comments, questions and constructive criticism are welcome.

Seb M J D
23rd July 2006



Note:

I've now done a full disection of the Uzi - a step-by-step break down is now available on request. There are 55 photos totalling 8.8 Mb.
24th July 2006



Enlarge image
   Firing Mechanism from rear.



Enlarge image
   Rear after firing, while trigger still depressed.



Enlarge image
   The innards.



Enlarge image
   Mechanism ready to fire.



Enlarge image
   Selector to full-auto



Enlarge image
   Selector to semi-auto.



Enlarge image
   Sights



Enlarge image
   Side view.



Enlarge image
   Trigger pulled.



Enlarge image
   Other side view.



Comments

 I like it 
  June 16, 2013
can you make LDD instructions please
  January 27, 2013
Please send Instructions to: Fighterace524@gmail.com. Thank you.
 I like it 
  December 6, 2012
Please send instructions, Thanks. Email: drummerboy5408@aol.com
 I like it 
  July 10, 2012
instructions please thiagocperrone@gmail.com
 I like it 
  July 10, 2012
instructions please thiagocperrone@gmail.com
 I like it 
  June 3, 2012
instructions please. hellohammyququ@yahoo.com
 I like it 
  March 7, 2012
please send instructions to joe.zemke@gmx.com
Sebastian Dick
 I like it 
lusticki pom
  November 30, 2011
Please send instruction to: lusticki.pom@gmail.com
  September 24, 2011
Epic design, and it works. That's pretty hardcore serious, to have all that for shooting rubber bands. I love it!
 I like it 
  June 7, 2011
my ump 45 moc shoots 1 at once and is larger how this can be made without instructions is amazing KEEP IT UP
Sebastian Dick
 I like it 
Logan Tomczak
  June 2, 2011
This thing is beast!, if i do say so myself and just to say to other people comenting, (i like to defend fellow moc-ers),how do you even know he has instructions and even if he does how could you expect him to send them to you after asking so rudeley, and not even saying "i think this is awsome", or "this is cool", but just demanding, and btw your moc is awsome!!!!
Sebastian Dick
 I like it 
kiwi kid
  June 2, 2011
THATS SICK!!!!!
 I like it 
  June 2, 2011
Great MOTD! Looks awesome!
 I like it 
  June 2, 2011
it actually fires! awesome!
 I like it 
  June 2, 2011
Very nice MOTD!
 I like it 
  June 2, 2011
Very coo gun design, i have never seen that kind of firing mechanism, it looks great! Awesome work, its a worthy MOTD!
 I like it 
  June 2, 2011
This thread is like an identity thief's dream. Don't worry about rubber-band shooting UZIs, worry about Nigerian email scams. Holy moly!
 I like it 
  June 2, 2011
Very impressive and congrats on MOTD! And don't worry: I don't want any "instruktions" :)
 I like it 
  February 26, 2011
hi, could you please send intructions to alexmercerprototype739@gmail.com. I think your gun is great!
  February 2, 2011
Hi, plz send instructions to timh26@gmail.com
 I like it 
  December 26, 2010
Niceeeee!!!! Can you send the instuctions to emre6697@live.nl
 I like it 
  November 20, 2010
well done! please send mechinism instrutions to bob-omb1999@hotmail.com
 I like it 
  November 14, 2010
I would also like instructions to this magnificent piece of art. E-mail: lilkev9412@gmail.com
 I like it 
  September 1, 2010
nice,very cool!:)
 I like it 
  August 17, 2010
Very nice gun ; The mechanism is the best :D. pls send instruction to GameMasterPZ@myway.de Thank you
 I like it 
  August 12, 2010
this looks amazing please send me the instructions to my e-mail adress mathofman@centrum.sk thank you
 I like it 
  July 15, 2010
please send me the instructions for it im been looking for in alwsome gun made out of lego for about a week now and i be the happest person in the world if you could email me the instructions Josephgarrison@comcast.net thank you.
 I like it 
  June 23, 2010
Awesome MOC dude. Love ur Gatling gun 2. Could I please have the Instructions at jaja_wawa@hotmail.co.uk. Thanks!
  June 23, 2010
could you plz send me the instructions soccercat@hotmail.com thanks
 I like it 
  April 21, 2010
I would also like the instructions plz send them to Vinsvh@live.nl thanks a lot!
 I like it 
  April 11, 2010
nice work!! please send those pictures to mattrhoff@gmail.com Thanks!
 I like it 
  March 24, 2010
You can send me one too :) brogi22@gmail.com
 I like it 
  February 15, 2010
arielj@aapt.net.au Looks cool! I would love to build it! Super Cheese
 I like it 
  February 7, 2010
ianrobot@gmail.com Thank you for making this :D please sand the how-to
 I like it 
  November 28, 2009
instruction please :) xcalibur13@live.com
 I like it 
  July 23, 2009
Gr8 work it is 1 of da best lego models i hav seen plz can u send me da photos 4 making it to generalpeel@hotmail.co.uk
 I like it 
  July 11, 2009
Very, very nice work, I would love to have a copy of the deconstruction photos. Some of the best lego building I've seen. Please send to mysticalTOA@msn.com.
 I like it 
  July 5, 2009
Hey mate, Legendary stuff. You have probably stopped responding to these requests, but just in case. Could you email me the UZI specs/photos to rabidblood AT gmail DOT com Thanks, Tim
 I like it 
  June 21, 2009
Amazing! May I also have the pictures please? lardydooty@yahoo.com
Sebastian Dick
 I like it 
Jamaal Primus
  June 5, 2009
Nice work, could I have the instructions please. I would love to try and make this. My email is jamaal_800@hotmail.co.uk
 I like it 
  March 21, 2009
whoa!thats one awsome firing mech u hav on that gun.....can u please send me the instructions at: diharaw@gmail.com
 I like it 
  March 17, 2009
Very nice work! Can you send me the instructions please? Many thanks.
 I like it 
  March 12, 2009
Amazing creation... Very nice work! If you can, can you please send the instrucions for how the firing mechanism works?
 I like it 
  March 12, 2009
Amazing creation... Very nice work! If you can, can you please send the instrucions for how the firing mechanism works at pureshot12@yahoo.com ?
 I like it 
  March 11, 2009
Hey again dude plz send me the instuctions at: Krogh.2@hotmail.com
 I like it 
  February 27, 2009
I've been trying to build one of these for almost three years! If possible, could you send me the instructions Vincent@vairocina.com? Thanks in advance.
 I like it 
  February 13, 2009
Please send me the instructions at i.paddy.g@gmail.com thanks!
 I like it 
  January 12, 2009
i love it have been using a gear systume for so long and lost hours of sleep over trying to make it semi auto if a dont post it could you send me the instructions please me email is tycoon257@gmail.com
 I like it 
  January 9, 2009
Awesome Gun. I would love to have the instrucitons! Send them to gdrakeley@hotmail.com if you find the time.
 I like it 
  January 4, 2009
could you send me instuctions at: shearb@maine rr.com Please??? Thanks!!!
 I like it 
  November 24, 2008
Please please please instructions!!! gunfun3000@yahoo.com
 I like it 
  November 14, 2008
hello could ypou please send the instructions to my email. thanks!! i love this gun good job 5 stars!
 I like it 
  October 19, 2008
Hi i really like your gun! I just finished my first Lego Gatling gun and now i'm looking for something not so intense. Id like some instructions on your fantastic Uzi please. My email is yugiohman11@gmail.com
 I like it 
  August 10, 2008
hey, I've made a gun with semi- and full-auto too, but mine have a lock mode and not as compact as yours. check it out anyway, if you please!
 I like it 
  July 9, 2008
Its GREAT!! youtube demonstration video pls. :)
 I like it 
  May 18, 2008
cool man,i like him. Can you make a simple full auto mechanism for me,please,i want a full auto gun. thanks.
 I like it 
  April 12, 2008
plese send me instructions!!!
 I like it 
  March 2, 2008
Congragulations. Minus this review, you have successfully acquired 228 reviews in a single MOC. Thus, I am obligated to prenounce you both the FIRST-place and the SECOND-place winner of the "Most Reviews Contest", unless someone else is lucky enough to surpass it. You lucky duck.
 I like it 
  February 6, 2008
i saw your other machine gun and asked for the blue prints of it. if you can, send me the bluprints of this one too thx
 I like it 
  January 17, 2008
awsome gun man i like your chain gun to if you could send me intstructions at teenplayer777@yahoo.com that would be great thanks and keep on building
 I like it 
  January 10, 2008
how does the fire selector works? i can now understand the firing mech, but the fire selector is incredible.
 I like it 
  November 28, 2007
that is one awsome looking gun great job check out my dumb guns
 I like it 
  November 25, 2007
Very cool. I will make one, or something like that.
 I like it 
  November 8, 2007
this is awesom i have some guns but only semi automatic could you please send me instructions!?
 I like it 
  October 9, 2007
this is FANTASTIC. i will add my e-mail for the instructions.... that is if youll share them. thank you. Bill gilagecko@gmail.com
 I like it 
  September 19, 2007
Nice !
 I like it 
  September 16, 2007
This is amazing! Could you please send the instructions to me? UPDATE: Instructions are here: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=212805
 I like it 
  September 15, 2007
Could you please send the breakdown instructions to <rahulb64@gmail.com>? Thanks! I love this thing! This is amazing! I've never been able to get the semi-auto mechanism right =(
 I like it 
  September 15, 2007
Hi, I REALLY digg this!!! Please send the breakdown/instruction to:<link4u_94@hotmail.com> I and my brother is really lego fans we have built many lego guns but not an uzi!!!
 I like it 
  August 22, 2007
i made your, but i had the problem that after loading 3 rubber band , ths semi-auto was goin full auto, so i improved your mechanism, so now its perfect! lol if you want i could send you pictures of it, very simple minor changes that changed the whole gun! lol so email me... btw for everyone that is searching for the instructions! they are on his Brickshelf folder!!!!!!
 I like it 
  August 10, 2007
can u please send me the breakdown? my email is thomas.larssomn@gmail.com
 I like it 
  August 1, 2007
Hey nice work :) can you send me the instructions for both guns which you put in here? it would be pretty cool to try rebuilding ist with my own stones. my email address is: marcelwassong@aol.com thx
 I like it 
  July 27, 2007
Thats awesome, please send instructions
 I like it 
  June 16, 2007
can yoyu send me a step by step instruction and the pieces list for the uzi (or chain gun) also,about how much would it cost to get the pieces my email is wowee0@yahoo.com
 I like it 
  May 28, 2007
Sebastian, if you mind me calling you by that, acn you please send me the plans to make the Semi- & Full-Auto Micro Uzi. please. i would apreciate it if you coudl send it to my emial address: Xslshlpkowlsx@yahoo.com
 I like it 
  April 30, 2007
Hello Sebastian. Well heres my review. I absolutely love your working design of your uzi. The thorough interior design to get the semi and auto program running is a great touch and will get you far in model designing(if you ever wish to go on to do that) I like the fact that you actually thought of a way to switch systems and made a switch to do that as well. You stated that you have a thorough indepth guide that is 8.8mb, but i cannot seem to find the link, unless you have to email me it. I would like that but if your too busy you dont need to. excellently done
 I like it 
  April 7, 2007
could you send me the instructions for possibly the best lego ever created? please!
 I like it 
  February 11, 2007
man, this thing is awsome, can u please send me the intructions? my email is wevin_yo@hotmail.com thanks!
 I like it 
  February 5, 2007
its a very iterestting design and the mechanism is superb i would very much like the instruction so i can intergrate it with a sniper rifle. please send it to godzilla121@hotmail.com thanx
 I like it 
  January 11, 2007
I like the robust design. I especially like your mechanism, but I can't seem to figure it out. I have been tooling around with different mechanism, but so far I have not been able to find a reliable one. This one seems great! Happy building! -Dan *edit* ahh, found your instructions on brickshelf.
 I like it 
  January 7, 2007
good design i admire how you used a diffrent type of firing mechanism plz send dirrections abe@abrick.com
 I like it 
  December 20, 2006
Hi sebastian, that uzi looks stunning! i like the way you fixed that beam mechanism, i tried various things but i don't get how you made that or even a multiple shot system, if you care or wanna help me out i could use some help on making a multiple shot system, if you dont , well then ill stick to my single shot gun :p, anyways, the email is kiddiecake@gmail.com and i hope to hear from you!
Sebastian Dick
 I like it 
nic shoun
  December 8, 2006
Very awesome, love everything, especially semi-auto, full-auto switch. If you could PLEASE send instructions on how you made gun, or trigger mechanism, it would be greatly appreciated. :)
 I like it 
  November 4, 2006
This seems brilliant. Would you please send me the plans? Thanks very much.
 I like it 
  October 21, 2006
This is great! I've been trying to make a gun like this, but the rubber bands keep on flying off all at once...could you send me the plans for this please? My email is OT_linked_dlman_VIII{at}hotmail{dot}com.
 I like it 
  October 20, 2006
Ok i've been workin my booty off tryin to make a small semi rubberband gun...but havent really succeeded...so will you please send me the step-by-step break down? thanks!
 I like it 
  October 19, 2006
This is pretty sweet. I need a new hobby, so would you mind sending me the plans to this and your chaingun. Much obliged.
 I like it 
  October 8, 2006
this is awsome! please send me the instructions if you do than i will forever be your follower. if you decide to send the instructions i have a new email address its tedward@mazzark.com and once again this creation is awsome
 I like it 
  October 1, 2006
Hey Sebastian could you send me break down pictures or insructions please. Regards Craig
 I like it 
  September 24, 2006
Did that guy below me just say you gave him the instructions? If so please can i also have them? Email me first if you can though.
 I like it 
  September 20, 2006
Man this is so cool, couldf you send me the pics so that i see how this awsome thing works and i could remake it? send it to: minos55@gmail.com
 I like it 
  September 12, 2006
Hey sebastian, I think you're techniques are excellent and you have some brilliant work to show for it... and one of the largest MOC hit counts I've seen! :-) I can imagine your satisfaction on completion of the Uzi's mechanism - it appears a lot of time and skill went in to both your models posted so far. I'm starting uni in the next few weeks, also reading engineering... it's obviously good for the creative thoughts! Keep building -David
 I like it 
  September 9, 2006
hehe send me instructions!
 I like it 
  August 28, 2006
This is amazing! Not so much the looks, but if it works and is comfortable, that is the main point. Could you please send some instructions? I've been trying to buld a lego gun for some time, and my most effective try is a full-automatic rubber-band gun and a single-shot brick launcher.
 I like it 
  August 24, 2006
Wow... Amazing... I didn't under-stand some of it though. It would be great if you could send instrouctions.
 I like it 
  August 7, 2006
This is one of the coolest, if not the best rubber band gun on the net. It actually works! Seb sent me the instructions, and I managed to construct it out of my collection! It fires the rubber bands quite far, and is impressive in full auto. Changing the gun from semi to full auto feels awesome. Great job, and I can't wait to see more of your creations.
 
By Sebastian Dick
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Added July 23, 2006
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