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Small explosive bullet with casing
I thought it would be worth sharing my explosive bullet design for all you handgun builders out there.
About this creation
Hi All,

I'm new to the forum but have been a Lego fan for the last 15 years. I have been designing a brick shooter handgun for some time now and always stumbled on having a big firing pin sticking out the back really far when the gun was cocked. Because real handguns have explosive bullets, only a small strike to the back of the bullet is required to fire. So that got me thinking: "how do I make an explosive bullet from Lego?" It was 3 days ago when the answer hit me!

Until I have a working model I won't submit my full handgun design, but I thought that it would be worth sharing the bullet design in case you wanted to try using it in your own mocs.

The way it works is the flexi system tube has a small length of pneumatic hose pushed over its end, forming a soft bullet tip. A pen spring (sorry all you Lego purists) is fitted over the back of the flexi system tube and the tube is pushed into the casing (1x1x1 cylinder brick with hole on top). When a small amount of pressure is applied to the flexi tube at the back of the casing, the spring pops the bullet out. Then you are left with a casing to eject just like a real hand gun. It's pretty powerful for such a small package (1x1x2H).

Things to note: There are different kinds of flexi system tube and I have found that the harder plastics are best for pinning the assembly together. Also, I found that a possible way to hold back the bullet and casing when firing is with a small tire (this probably won't make sense until you try building one).

So the discussion topics I wish to raise are: Have you ever designed an explosive Lego bullet or even a Lego brick shooter? Do you have any suggestions/recommendations for my design? Can you think of a way to stop the spring from flying out after the bullet? Do you have a handgun design that might be able to utilise this bullet? If so let me know and share your outcomes.



Comments

 I like it 
  June 25, 2014
Good idea. I prefer to use a 1x1 round plate on the end and set it off just by hitting it with something to dislodge it. Do you have any ideas on how I could make a revolver cylinder to hold the bullets?
  June 25, 2014
Do you know of any guns using this yet?
 I like it 
  August 20, 2012
what if you could glue the bottom of the spring to the casing???
 I like it 
  February 23, 2012
That is sooo cool. Too bad I can't make it... I aplaud you effort to make a lego gun that is so realistic. I would like to see the finished product too!
 I made it 
  November 21, 2011
Great news Peter. Be sure to post a link to it here when it's done, or even some progress photos as you go. I've not had a chance to post in a while but I have a nice magazine design that I need to put up. I'll pop a link here when I get some time.
 I like it 
  November 21, 2011
Well it looks like i have found myself a gun which i can put this cartridge into the H&K MP7
 I like it 
  November 21, 2011
Well it looks like i ahve found myself a gun which i can put this cartridge into the H&K MP7
 I made it 
  September 24, 2011
Cheers Captin Pasquale. It shoots the small length of flexi system tube with the pneumatic hose tip. These two components don't separate, they make up the bullet.
 I like it 
  September 23, 2011
Amazing! You might just revelutionize how lego guns are built. Ive only had good success with full size rifles because Of Large Mechanisms. But now Pistols can be made. And maybe even more powerful rifle sized rounds. What does it shoot though? You, my friend, are a genius.
 I made it 
  September 23, 2011
Thanks Brix Whiz. Power depends on the pen spring but probably gets 4 - 5m with a reasonable level of accuracy. The program is just Google Sketchup. I simply drew up the components but downloaded the cylindrical brick from 3d Warehouse. The cross section is a modified version of the component. I would normally use SR 3D Builder for my initial designs but this one involved unusual elements (pen spring and a tiny length of pneumatic hose for example) that aren’t available in it.
 I like it 
  September 21, 2011
Very nice idea. How powerful is it though? And what progam did you use to make that cross-section? Great build 5/5!
 I made it 
  September 21, 2011
That's why I posted it Peter. I hope that it can offer a new way of creating small pistols. If you get something working, please post it.
 I like it 
  September 21, 2011
wow this is a really good idea if you dont mind i was wondering if i could use it for possible future guns
 I like it 
  September 4, 2011
Cool idea.
 
By Heath Barker
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