Rotary magazine

So I've been trying to build again. I had an entirely different project in mind but I noticed that the teeth of gears fit into the grooves of rods. I was experimenting with it quick to see if a gear would make a decent pin lock (it doesn't). I kept toying with it until I went off on this entirely random tangent without planning on it, hence the mismatched colors for the one slot connectors. 

Anyway, this is a rotary magazine. Similar to a drum magazine, it's just a magazine in cylindrical form factor rather than a linear form factor. I'm not sure if anyone was able to successfully make one before. This version in particular stores 12 usable blue rods and one extra one that can't be fired. It has a ball joint connector to act as a paddle to help ensure the rods continue feeding without skipping teeth. I don't have many dark grey connectors but otherwise I'd scale this up using red rods and then store yellow rods. It'd be more useful as it'd fit more nicely with a connector body. Currently to maximize ammo use, I'm trying to fire directly from the magazine without feeding it further vertically. The problem is it's obviously an awkward fit. If you imagine a typical 5 layer gun, it'd fit in between layers 1-2 and 4-5 about halfway each. It's entirely doable, but just doesn't look too pretty.  

It's nice in that it allows you to store a fair amount of ammo in a relatively compact amount of space, but it's otherwise not a practical storage solution as is. Aside from just trying to figure out how to attach it to a gun, figuring out how to reload it conveniently would be difficult. It -might- be more useful if it can be turned into a roofed, removable magazine. Then at least you can preload them first. 

I hope someone can give a weapon that uses this a shot. Perhaps a bolt action for better performance. And again, I'd scale it up to store yellow rods so it's a little easier to use in a standard connector body. 

Here's a quick video demonstration and a look inside it at the end:

Picture of Rotary magazine
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Nice concept! If it's alright with you, I may try incorperating this in one of my next guns.

TheDunkis (author)  The Knex Inventor1 year ago
Please do, I'd like to see others try to fiddle with it.

Great! I will see what I can do with it.

BTW, I am currently searching for ideas of something to build and post
with K'NEX. If you have any ideas, please visit ( and
you can tell me your idea in a comment. If I build and post your idea, I
will give you partial credit.

TheDunkis (author)  The Knex Inventor1 year ago

By the way, you can see a working example of the concept on my Barackuda, which is posted in another thread.

Don't have any ideas at the moment but I'll let you know if I do.

Yes, I saw that thread. I will take another look at it.

Great! I look forward to hearing your ideas when you get some!

TheDunkis (author) 2 years ago

I hate how slow in progress I've been, off and on, but I'm determined to finish something for once. I don't know if I mentioned, but I'm working with BM to help finish up my weapon. If I can remember after work today, I'll get some pictures and start a new forum topic. It's in a state I'm more comfortable showing, but it still needs some work. Mostly I need to figure out a good bullet lock + feed ramp that still maintains decent accuracy and range.

TheDunkis (author) 2 years ago

Man these forums are dead, it's rather sad. Anyway, weapon progress:
-Front of the body is completely finished, at least until test firing
-Back of the body is pretty much finished, may make small adjustments
-Magazine is finished. Removable and preloadable
-Handle is mostly figured out, though I'll be making adjustments for comfort
-Trigger works but could use a little improvement
-Bolt is figured out but not built yet
-Still need to build stock

Great, it seems like the build is starting to come together! Have you given any thought to using a thumbhole stock on it?

I have a gun that will be out fairly soon. It is a weird but cool looking gun that seems like it came straight from JonnyBgood's K'nex designs. It has a unique trigger system that blocks the pin far back, giving it about 6 3/4 inches pin pull, which is nice. At the moment it is only single shot, but I might convert it to bullpup or free flying slingshot.

TheDunkis (author)  CorgiCritter2 years ago

I've not only given it thought, it's what I'm building at the moment. The way I designed the back of the gun and bolt requires it because I like my guns compact.

Sounds interesting, I'll be keeping an eye out for it.

Whoot! I love thumbhole stocks!

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