"Gunzo the Great" Knex Semi-Automatic Rubber Band Gun

Picture of "Gunzo the Great" Knex Semi-Automatic Rubber Band Gun
This is a Semi-Automatic Rubber Band Gun (by which I mean it SHOOTS rubber bands, since I think the ones that shoot rods hurt too much). It's designed to be as RUGGED as possible, because I was tired of stopping our RBG wars every 2 minutes because somebody's gun broke.

The spacing of the 2 gears that make up the repeater mechanism at the heart of this gun was adapted from MrRadicalEd's RBG Repeater, because it's so simple and works better than all the more complicated ones I've made or tried.

Picture 1: Complete "Gunzo The Great"
Pictures 2&3: Shows my adaptation of MrRadicalEd's 2 gears. (just a model demonstrating the size and relative positioning of the gears)

Thanks to MASTERMIND for the piece count:
6 white connectors (8-way)
38 yellow connectors (5-way)
6 green connectors (4-way)
20 red connectors (3-way)
4 light gray connectors (2-way)
2 dark gray connectors (1-way)
2 blue tabless (or tan tabbed) clip connectors

97 green rods
34 white rods
9 blue rods

7 blue spacers
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Step 1: The Gun Sides

Picture of The Gun Sides
Build 2 of these. These are the Gun Sides.
Note, the Red Connector in the middle is missing in a few of the later pictures. That was a mistake. It is always supposed to be there.

Step 2: Trigger And Spinner Wheel

Picture of Trigger And Spinner Wheel
Picture 1: trigger pieces. Note the blue spacer, and the dark green rubber band.
Picture 2: spinner wheel

Step 3: Barrel Pieces

Picture of Barrel Pieces
Make these Barrel Pieces and set them aside

Step 4: Handle Pieces & odd parts

Picture of Handle Pieces & odd parts
Pic 1: Make 4 of these. We'll call these "Handle tips"
Pic 2: Make 2 of these. We'll call these "Handle Spacers"
Pic 3: Make 1 of each of these. They are the "Red Handle Base" and the "Yellow Handle Base"
Pic 4: These are called "Through Rods" or Thru-rods. (All Orange connectors are temporary)
Pic 5: These are Side Clips. You'll actually need to take the grey connector off of the white Snowflake connectors, and replace them at the end of step 9.
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randoman22111 months ago

cool this is amazing!

shoots 100 ft.

wiishadow44 years ago
 best knex gun ever.
there is better (not that this isn't good) likes the s3. its is semi auto and shoots pieces.
Inventor X3 years ago
This is totally my choice of weaponry in a RB war. Compact, sleek, and has a ncie look. The trigger is a light pull, and has modding capabilities. Thanks for building such a great gun! (No wonder it's called "Gunzo the Great" !) :)
Spycrab4 years ago
I LOVE this gun. It's a big gun, which is sweet and all, but for people with only a few pieces, (like me),well, it uses a lot of pieces. It is WELL worth it, though. =D 5*, you deserve it.
123bob3215 years ago
danroy, its clear enough to "see" and make
so why complain?
123bob3215 years ago
This is my favorite RBG. =D
brammeke116 years ago
This is the first Repeating rubberbandgun
revtiedye (author)  brammeke115 years ago
Yep, that's the same one I mentioned in the description. Thanks to Mr. Radical Ed's design. I think I'm going to send him another thank you note.
Ow, sorry. didn't read that the first time
eskimoboy5 years ago
Hey, this is really great design. You managed to make the gun strong without requiring us to clip 7 connectors onto a rod all at the same time in an internal space while doing a dance and baking a pie.
revtiedye (author)  eskimoboy5 years ago
Yeah, thanks. I'm not a big pie fan, and I'm a terrible dancer, so I never got into that style of Knex Design.
ponddust15 years ago
you can still see what your doing
danroy995 years ago
blurry picture
it's not that bad
101man5 years ago
best knex rbg EVER!!!!!!!!!!!!!!!!!
stopanator5 years ago
rev nice gun but i need a bit clearer instructions sorry but adleast this gun is still the best rbg pistol
best rbg gun ever total 5 star :D
Thanks for that encouragement! I know the gun can work well, although it apparently doesn't work for everybody. I thought maybe my instructions weren't clear enough. I'm glad you were able to use them for a successful build.
I combined this gun with knexguntutorials's shotgun. The result? Good.+
revtiedye (author)  Miles Tails Prower5 years ago
Nice Miles! Thanks for uploading the pic!
Why do all knex rbg's jam a considerable amount?
Not all, just semi-auto ones anyway...
not all do they work quite well actually it just may be that if you make it and forget a single spacer or something like that it jams
I build some of em with large spokes on the wheel like this one, and the band doesn't even pull off of the wheel sometimes.
are you holding down the triger? sometimes that causes it to do that, also you could try lengthening the barrel to create more pull on the gear
Is your avatar like a russian MiG or something (and yes, I do know what a MiG is)?
my avatar is the Russian su-37. the f-22 raptor was designed to combat this aircraft. however, Russia came up with the su-47, which is faster and can carry more ordinance than the f-22. to answer your question, the mig-31, was the original frame for the su-27. this evolved into the su-35. that was redesigned to the su-37, my avatar.
I don't hold the trigger, and the shot flies off with the next one, but I don't have the knex to mod every gun I build. thanx anyway.
how many ruber bands do you use and how thick are they, if you try lowering the thickness or lowering the number then your last effort would be to use stronger knex pieces at the triger and spoke areas
The bands aren't too thick, but not quite thin. However, they are sort of weak. And it's not that the knex pieces are messed up, the spokes are just too long.
well the only thing you could do is lengthen the barrel, I lengthened my barrel on the top by 2 yellow half circles which ended up giving me 20 extra parts, which i think is resonable
i'm more interested in knex guns that shoot rods anyway. So I'll just forget about knex rbgs for now
revtiedye (author)  Oompa-Loompa6 years ago
When you load the rubber bands, loop it over the first rod that is leaning backwards. On this gun, it's about One O'clock. And make sure the rubber band rests on the wheel connector NOT on the rod. If you just place it on the rod, after you load more rubber bands, the tension will pull the RB down and get pinched between the rod and the connector, and jam. I've been doing it this way so long, I forgot there was any other way, and was amazed at your original comment. My guns never jam.
I know that is how you load the gun, but when the spoke leans forward, as to release the band, the band just slides like halfway up the spoke instead of coming off.
revtiedye (author)  Oompa-Loompa6 years ago
After you load the gun this way, the first time you pull the trigger it won't fire, but from then on, it works great. Alternately, you can load the last rubber band without cocking it, and you're set to go. Again, I've been doing it this way so long, I forget to state what seems obvious to me. But I've got several of these around the house, and we have wars all the time. And they never, ever jam. Once you learn how, it's easy. Sorry it's so hard to learn.
Forget it you have no clue what I'm talking about... So stop acting like I'm the clueless one here, k?
revtiedye (author)  Oompa-Loompa6 years ago
Oompa Loompa,

I'm really sorry you took offense at my answer. I absolutely don't think you're clueless. I know for certain I'm a terrible communicator, because I always use too many words, and say the same thing over and over again. I forgot I had added an entire step in the instructible on "how to load the gun." I didn't realize I was just repeating myself.

It's just what you said:

but when the spoke leans forward, as to release the band, the band just slides like halfway up the spoke instead of coming off."

...that's a perfect description of how the gun works, except that's not when it's supposed to "release the band." It's not supposed to release until you pull the trigger again.

Thanks for letting me know I ruffled your feathers. Otherwise I never could have apologized.
Maybe my bands were too small, because sometimes when it's apparently "not" supposed to come off when the spoke leans forward, it will every once in a while, either jamming the gun or shooting two shots at once. But I wasn't trying to start an argument, sorry bout that.
i builted a semi auto ketchup gun!!!!!!!! load 9 ketchup packets into the handle, cock the slide, and as you pull the trigger, it squeezes the pack w/ hella force! a spray of catsup comes out the front and the slide is automatically pulled back and releases the empty pack!!!!!! it is semi auto. pull trig. splat. repeat.
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