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Well, here it is. My blue rod shooting, 7 shot semi-automatic k'nex gun.

It's no more or less powerfull then most sub-automatic guns, and is very reliable ( It sometimes misfires, but it never jams ).

It's not a perfect semi-auto, because you can't keep your finger on the trigger at all times. You pull the trigger and let it shoot back into place, and then pull the trigger again.

P.S. Sorry for the slightly blurry pictures, I don't have any good camera's.

Step 1: Trigger

This is the trigger. It should be easy enough to build.

Step 2: Left and Right Mech. Panels

1. This is the left panel, it includes all connections to the right panel.
2. This is the other side of the left panel. Make sure you put the 2 grey spacers on, they stop the back of the gun from collapsing inwards.
3. This is the right panel. It's basicly just the left panel without all the connection points.

Step 3: Firing Pin

This is the firing pin. You don't need to tape the spacers, but I did so because grey spacers tend to wear down. The trigger connects onto the ball joints.

Step 4: The Barrel

1. This is the barrel and magazine, what you will be building in this step.
2. First build this. There are 15 yellow connectors.
3. Now build the barrel. The grey connectors are decapitated. ( see picture 4 ) You can also break an orange connector in half.
4. You will need 2 of these, you can't use black ball joints!
5-6. Build the magazine.
7. Build the extra support
8-9. Attach these 3 parts together.
10. Add 2 metallic blue clips ( You can also use 2 spacers and 1 tan clip ) on each side.
11. Add the extra support

Step 5: The Handle

This step is pretty easy.

1. The side
2. The front
3. The back

Step 6: Put It All Together

In this step you will assemble the parts.
1. Add the trigger to the left panel. Make sure the white rod through the grey connectors goes through the hole in the white connector.
2. Now add the right panel.
3. Add the handle. Note that I turned it around, don´t get confused.
4. Add the firing pin to the barrel.
5. Now add the barrel to the rest of the gun. You´re done! Be sure to check step 7 for the rubber bands.

Step 7: Rubber Bands

In this step you will add the rubber bands
1. These are the rubberbands I have on. you need 2 thick rubberbands and 6 small thin ones.
2. double up 2 rubber bands 2 times and put the on the trigger like so, one on each side.
3-4. Add the thick rubberbands and 3 thin rubberbands onto the firing pin and upto the front. Now test fire a few times. If you think it's too weak, try to add more rubberbands. But when it doesn't pull back the firing pin far enough, or not at all, remove some rubberbands. Try to get the perfect combination between pulling back distance and power.
5. Put the final rubberband on the magazine like so. You're done! load some blue rods into the magazine and fire away!.

Step 8: Grey Connector Barrel

This is a mod that will make it shoot grey connectors, which get you more range. Before you begin take of the entire barrel.
1. First edit the firing pin. Take the spacers of, and replace the middle yellow connector with a blue. Don't forget the green rod! This makes sure the red rod doesn't shoot of. Also don't forget the green rods on the yellow connectors.
2. Now remove the blue rod with the 2 spacers in between the panel, turn around the white rods, and place is as shown in the picture.
3-5. Now start the barrel. The pictures show the side, the top and the bottom.
6. Now add these rods to the barrel.
7. This is the magazine. You can see it is somewhat the same as Oodalumps'. It will hold 7 shots, if you want you can make it taller so it can hold more.
8. Simply add it to the barrel like this.
9-10. Add the firing pin to the barrel, and add it to the back of the gun.
11. Now just add some yellow connectors above the barrel, and be sure to connect them with a blue rod at the front.
12. And finally build the pusher rod.
13. This should be the finished product. Just add the rubberbands to the trigger, and to the front. Make sure you have at least one big, or a few small ones wrapped around the upper blue rods, or else the firing pin will be too low for the trigger to connect.

Now load it, add the pusher rod ( with a rubberband ), and have fun.
looks like spas 12<br>
the gun was okay but i modded it to shoot around 25 feet and also plan on using the magazine on other guns<br>
its a gd gun it works fantasticly, exept i spent 2 hours buildin somtin that shoots about 2 meters :(
Pretty sweet prototype mech, I'd really like someone to improve on it =) I tried making it but then saw the comments saying in wasn't that great, and stopped. But I really do think the mech is amazing!
this gun is not powerful enough i had put 2 big rubber bands on it in 2 thin ones the firing pin does go back but when im shooting it it just doesnt get the speed needed to like pierce through paper =(<br/>
This gun can't go through paper. It's an experimental semi-auto. To make a powerfull semi auto is nearly impossible with just K'nex and rubber bands. Otherwise it would still be a huge gun.
kan i make dis gun without y connectors?
omg you like hitman also:D
thanks but no thanks i made it already its okay.!
kan i make dis gun without y connectors? kan i make dis gun without y connectors? kan i make dis gun without y connectors? kan i make dis gun without y connectors? kan i make dis gun without y connectors?
that sux =(<br/>
i know , they look so realistic
I finally found it. This was the first gun I built when I came to ibles 2 years ago. Wow, I never thought I would find it again.
xD You picked a bad one for your first though. I guess that means it only got better from then on, right?
YA But like I said it was my first so I didn't know how it would turn out.
But the concept was good.
That was the idea, after all. Too bad nobody ever improved it.
you dont either
for some reason this looks like you.
I assume that there is no alternative to the ball joints?
Don't think so, though I'm not entirely sure. There's probably a way, but that would require an entire redesign. This gun isn't good at all anyway.
K, thanks
wait, so when you pull the trigger back, it shoots? you don't have to pull back the ram?
In theory, but it's not flawless. You need to let the trigger go after every shot so it can catch onto the ram.
interesting, what is the range?
Do you know what this reminds me of, if anyone has playedjames bond night fire, the bad guys have shotguns that look like this, they also have pistols that also looks like this? Nice gun by the way.
Have that game saved to my Xbox 360 hard drive
You know... this gun kinda looks like the spas 12 shotgun.
Maybe without the ammo rack/ Heat guard. looks like the gun from Mass Effect For Xbox 360. Pump grip maybe looks the same instead of the combat grip.
this gun cant be powerful
What's the point in saying that? It's not. /discussion
im saying that because it uses ball joints to snap the ram on the trigger,and too much power the ram will snap off the trigger
So? That's the idea of this gun. It's not powerful, it's just innovative. Besides, I found that it got better ranges then some regular repeaters.
I cannot figure out how the trigger system works can someone please post a vid of firing
The trigger snaps onto the firing pin, then when you pull it back it will cock it untill the trigger can't take the power anymore and the gun fires. It's pretty easy, but not very functional though.
i didnt like the power from it either so i HEAVILY modded it now it looks like a 12 gauge, a combat shotgun and a mossberg 500. ill see if i can post it when i get a good camera.
I dont get the mechanism and I am short on pieces so I cant build it plz explain!
I cannot get this thing to work (without modding it). It's a really good idea, though. I wish I'd thought of it. Keep up the good work!
I thought the normal version would be easy enough. The grey connector shooter is pretty bad though, I've realised some ways to make it more effecient, but I haven't really gotten around to doing any knex lately. Lots of tests and whatnot. I hope to start on an idea I've had for a while in winter break. ( for a new gun )
3 words: GENIUS!!!!!!!!!
lollerskates
What's this new idea? Maybe i can steal it off you :)
Right, how stupid do you think I am
Well, I'll just say that I hoped you would be overwhelmed by a sudden bout of generousness, and then you would spill all of your deep and dark k'nex secrets to me and everybody else on instructables.
If you want POWER, then put a rubberband or two on the firing pin. It makes it more semi auto too. And I added Oompa-Loompa's folding stock, too.
=D<br/>
i added a GL to it!
IT REALLY IS SEMI-AUTO!! THANK YOU
ive just finished the gun, to fire it, does the trigger pull back the firing pin and then theres a click as the Y connecters snap from the ball joints? is that how it works cause ive made it work kinda but it does'nt sound too healthy is that whats supposed to happen? if not, what?
Yeah, that's how it works. It's pretty experimental. There's probably much better ways to achieve the same effect. I've never tried to look into it that much.

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