Introduction: UP3 Knex Pistol

Picture of UP3 Knex Pistol

The latest in a long series of reliable, tried and tested, single shot knex pistols.

The UP3 is simpler, thinner, sturdier, and requires less parts than it's predecessor with no change to it's function or range.

This is my choice battle weapon.

Fires yellow rods 45 feet. Holds one elastic.

Step 1: Handle

Picture of Handle

1: Build this.
2: Build this.
3: Build this.
4: Connect 2 and 3. (and add a gray rod as pictured)
5, 6: Connect 1 and 4. (and add two green connectors and a blue rod as pictured)

Step 2: Barrel

Picture of Barrel

1, 2: Build this. (it's symmetrical)
3, 4: Build this. (it's symmetrical)
5: Build this. (it's symmetrical)
6: Connect 3, 4 and 5.
7: Connect 1 and 6.
8-10: Build this. (it's symmetrical)
11: Connect 7 and 8-10.

Step 3: Assembly

Picture of Assembly

1, 2: Connect the handle to the barrel.

Step 4: Firing Rod, Elastics, and Barrel Tips

Picture of Firing Rod, Elastics, and Barrel Tips

1: Build this.
2: Add duct tape and elastics as shown.
3: Add elastics as shown. Attach a blue, zero slot, connector to the firing rod in the noted location.
4: Attach barrel tips (acts like a funnel to make loading rods quicker and easier).

Step 5: Yer Dun!

Picture of Yer Dun!

Build another and play with a friend! Make sure to rate.

Comments

jaffawarrior1 (author)2013-02-02

Update 3 95mm x 3mm elastics

jaffawarrior1 (author)2013-02-02

*elastics not plastics sorry typo

jaffawarrior1 (author)2013-02-02

I made it hold 2 95mm x 3mm plastics and it will dent a deodorant can from about a meter

PotatoCoffee (author)2012-08-24

Nice job!

Oblivitus (author)PotatoCoffee2012-08-24

Thanks! And as I said, this is my choice battle weapon.

PotatoCoffee (author)Oblivitus2012-08-24

A wise one to! Oh and why is your profile picture... POKING me?!

Oblivitus (author)PotatoCoffee2012-08-24

I just read your orangeboard comment, lol. Yes, I took my profile photo out of its original context.

PotatoCoffee (author)Oblivitus2012-08-24

Ah okay! =D How is the UNPOSTED Z3 coming along?

Oblivitus (author)PotatoCoffee2012-08-24

I got stuck in the instructions. It's mostly done but I haven't worked on it for weeks. Sorry. I'll get it finished someday.

PotatoCoffee (author)Oblivitus2012-08-25

I understand it's not surprising it looks like one hell of a gun! Good luck!

Oblivitus (author)PotatoCoffee2012-08-25

Thanks!

PotatoCoffee (author)Oblivitus2012-08-25

No problem!

Oblivitus (author)PotatoCoffee2012-08-24

I got stuck in the instructions. It's mostly done but I haven't worked on it for weeks. Sorry. I'll get it finished someday.

Sharir1701 (author)2012-01-05

pics 8-10: is the black thing under the blue clip just before the 8 blue spacers a ball socket?

Oblivitus (author)Sharir17012012-01-05

Yes.

Sharir1701 (author)Oblivitus2012-01-06

yeah... i found out my self simply by inserting a grey rod in the back and seeing that it reaches exactly up there to clip in. nice gun, by the way. shoots 40 feet, no problem. relatively accurate, too.

Oblivitus (author)Sharir17012012-01-06

All right. And thanks. The best thing about it is that if you use it for a long time you'll notice the reliability is better than any other gun out there. The elastics and tape last months because of the design, the trigger won't slip, it won't misfire, pieces won't break off, etc... It's reliability is it's best feature.

Sharir1701 (author)Oblivitus2012-01-07

Yup lol. Also, i like the fact you can clip the bullet in before you take back the ram...

Oblivitus (author)Sharir17012012-01-05

Sorry about the lack of labeling. I just added a note to it.

Sharir1701 (author)2011-10-19

how do you add pieces like hinges, blue clips, ball joints etc. to mlcad? and how do you permanently keep a part, for instance, the Y-connector that you showed how to make, how do you save it as a part?

link13 (author)2011-10-01

This is very neat. I have had no experience with knex at all. I was curious if this would be strong enough to pull string along with the bullet. If so, about how far do you think it would shoot with the string? Thanks.

Oblivitus (author)link132011-10-01

Are you suggesting attaching one end of a string to the gun and the other to the bullet so that you could pull the bullet back in?

In any case, I'd suggest the UP2 because it can handle at least double the elastics that the UP3 can. That'll give you the power you're looking for if you need it.

Mace! (author)2011-06-27

Here's mine. As you can see I changed around the back the stabilize the rubber bands. This allows a grey rod, instead of a strong black rod, to be used. People usually have more of these, so more pistols could be built. I fixed the trigger from breaking by taping it first of all (electrical tape works best, I ended up switching it), and switched the red connector to a green one. To do this, I had to remove the small metallic blue connector. All in all, it's a great gun, and shoots 45 to 50 feet with three strands of two #32's tied together, and a doubled #32 on the trigger.

Oblivitus (author)Mace!2011-06-27

Cool, glad you like it. I only put one elastic on though, so mine didn't need the tape or stabilizers.

Mace! (author)Oblivitus2011-06-30

When I put one elastic on, the firing pin wouldn't even go forward because of the metallic blue piece on it. It is worth having it though, since the firing pin doesn't accidentally come out. You probably have better rubber bands. But it's definitely the best one in the series, keep up the good work!

Holmes101 (author)2011-06-23

Nice gun. good range, too. I don't understand why some people are against the trigger- it seems fine to me. BTW, how come everyone shoots knex rods? I prefer airsoft ammo by far. But great gun- nice looks and everything.

DJ Radio (author)2011-05-23

The UP2 was better. This has a BK trigger that can easily break. Also it blocks a bit too far forward.

Oblivitus (author)DJ Radio2011-05-24

It gets the same range. Therefore the UP2's "better" trigger was unnecessary.

I also found in testing that more elastics does not increase bullet velocity at range. The only thing it does increase is penetrating power at short range. Really only good for breaking things, that power is useless in battle. Once again, same range, same bullet velocity.

more bands doesn't equal an increase in range because rods are unstable an tumble violently in flight
add fins and now more bands equals more range and a quicker flight of the shot
but it really depends on what is being shot too however in general rods will never shoot further than 50ft "accurately" they have the worst aerodynamic flight characteristics ever lol
so i agree an disagree at the same time nice gun btw

Thanks. I think that I summed up our argument pretty well below; this is what I said; "I think DJ is right that the UP2 could have been better if I'd used the firing system he mentioned, but it is not better than the UP3 as it was."

DJ Radio (author)Oblivitus2011-05-24

The UP2's trigger is needed because it is much less likely to break. I don't like having to run around in battle with a broken trigger. And I have tested similar, although I find that it does increase bullet velocity at range. Try the same experiment on a NAR, using the same red rod fin ammo. I find that with 2 bands it only goes a mere 30 feet, but with 7 or 8 it goes well over 140 feet.

Oblivitus (author)DJ Radio2011-05-24

"The UP2's trigger is needed because it is much less likely to break."

It never does if you don't put too many elastics on it.

"And I have tested similar, although I find that it does increase bullet velocity at range."

I did not find this.

"Try the same experiment on a NAR, using the same red rod fin ammo. I find that with 2 bands it only goes a mere 30 feet, but with 7 or 8 it goes well over 140 feet."

This doesn't use fins, the range will not increase by adding elastics and firing standard rods.
Sounds interesting though. Thanks for that bit of info, maybe you should try fins with the UP2. You'd have to make a shorter barrel for it to fit them though.

Vynash (author)Oblivitus2011-05-24

I think the man knows what hes talking about DJ.

Oblivitus (author)Vynash2011-05-24

Thanks. I think DJ is right that the UP2 could have been better if I'd used the firing system he mentioned, but it is not better than the UP3 as it was.

Vynash (author)Oblivitus2011-05-25

Yeah, I see.

I'll build this when I have some free time =D

TheDunkis (author)2011-05-25

Eh, it'll be perfect for newbie builders but it's a little too simplified for my tastes. That's the point of the weapon. I don't like how far up the trigger blocks considering it wouldn't be hard to make a trigger that blocks closer to the back.

~KGB~ (author)2011-05-24

Another great gun =D

Torpe (author)2011-05-22

Is this better than beast pistol

Oblivitus (author)Torpe2011-05-22

Yes, the primary advantage is that it's drastically more reliable.

Torpe (author)Oblivitus2011-05-23

Thanks, I'm building this right now.

Oblivitus (author)Torpe2011-05-23

Cool, tell me what you think when you're finished.

Seleziona (author)2011-05-23

Nice, looks good

AUG-5OM3 (author)2011-05-23

Good job!

beanieostrich (author)2011-05-22

Nice job =D

Oblivitus (author)beanieostrich2011-05-22

Thanks.

beanieostrich (author)Oblivitus2011-05-22

No problem =D

Football viking boy (author)2011-05-22

i like how you do most of your knex ibles on the knex software, it makes it easy to folllow. also nice gun

Thank you.

About This Instructable

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Bio: I paint, write music, and used to build knex guns. I have a Bachelor's Degree in Studio Art. - updated 5/7/2014
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