Introduction: Knex RBG: Plasma Pistol

 A Knex repeater RBG, resembling the Halo Plasma Pistol.
Plasma Rifle
-Looks and fires like the Halo Plasma Pistol
-Small and light. Hide it in a hollowed out textbook :D
-Not really semi-auto since it may occasionally fire a burst of two rubber bands, even if the trigger is pulled once.
-Uses a modified piece.
Suggested use: Primary/ Secondary RBG
Similarities and differences between Plasma Pistol (according to Halopedia)
-Both may not fire projectiles when low on ammunition (this one may not fire if the rubber bands are too long, or not enough are loaded).
-Both are semi automatic 
-Both have a similar shape.
-Accuracy is similar.
-Does not home in on a target.
-Half the length and height of the real plasma pistol. 
-Only holds about 10 projectiles, not 200 (If you think of this as shooting overcharged bolts, this is a similarity)
-Both have the potential to stun (when aimed at the face for this one)

Step 1: Pieces Required

6 green
15 white
7 dark grey
5 red
17 green
11 yellow
1 white
2 orange
*If you have spacers, you will only need 3 dark grey and 13 white

Step 2: Special Peices

If you have connectors, 

Step 3: Barrel

 Assemble the following according to the pictures.

Step 4: Handle

Assemble the following according to the pictures.

Step 5: Fore-grip

 Not necessary for firing, but make it will look more like the Halo Plasma Pistol.

Step 6: Firing Mecanism

Step 7: Assembly

Attach fore-grip to barrel, and handle to firing mechanism. Then attach barrel and fore-grip to handle and firing mechanism.

Step 8: DONE!

Here is a video of how to reload and fire. Since I only have two hands, I used a chair to hold the pistol. Also, I used rubber bands that are too long, so the trigger has to be reset manualy by pushing it forward.

Step 9: Overheat Lid

Not necessary, but makes it even cooler!
Based upon SonicX 22's mod


Fr-Pa-Co made it! (author)2011-02-15

I dont like things like this breaking your pieces to make something you'll keep for about 2 weeks

charge11595 made it! (author)charge115952011-02-15

I have nothing against your belief and totally agree with it. I have a used (preowned) set of knex, and any broken pieces I use were already broken by the previous owner. If you have broken pieces already, why not break them further to make the useful?

K1TK4T 117 made it! (author)2010-09-27

well, it took a while to make but its finally done, i also made the heat vent and got that working 2. now i have a plasma pistol, a plasma rifle and my own custom energy sword whish is far sturdier and better looking than any others on the internet (no im not boasting, im just saying)

charge11595 made it! (author)charge115952010-09-29

Make an instructable and let the world be the judge:)

goffymew56 made it! (author)2011-02-18

im stuck on this part a little help please

charge11595 made it! (author)charge115952011-06-20

Which part?

dursa made it! (author)2011-01-29

my poor red piece

knexsuperbuilderfreak made it! (author)2010-11-16

its decent works best with tiny bands so you can load alot or #64 work ok to 4*

tayatipoop made it! (author)2010-10-08

how to load

charge11595 made it! (author)charge115952010-10-08

Was that a question? If it was, there is a video in the second last step.

thehaydn made it! (author)2010-09-18

that took me ages to make cus instructions arent very good but AWSOME gun

knexinglemon made it! (author)2010-08-23

do you have to cut the peices

charge11595 made it! (author)charge115952010-08-25

Yes, unless you can think of something else, like biting them into the right shape... :P

DutchxGuy made it! (author)2010-07-22

I think i would love this gun but, the instructions are so confusing, need more angels.Thanx=P

charge11595 made it! (author)charge115952010-07-24

You should see my plasma rifle (CLICK HERE). If those instructions are easier, i could change the plasma pistol instructions to be similar to the plasma rifle.

Spycrab made it! (author)2010-07-01

Also, i have to ask: what does the modified piece do? I've got a small gray conenctor on there and it seems semi-auto, like you said.

Spycrab made it! (author)Spycrab2010-07-02

I made a slightly bigger version, if you'd like to see it. Here it is, next to my laser tag plasma pistol :p

charge11595 made it! (author)charge115952010-07-04

Cool mod. Please post because I don't think I have enough green rods to build it myself :)

Spycrab made it! (author)Spycrab2010-07-04

Alright, I'll post it along with a needler I made when i get the chance. :)

charge11595 made it! (author)charge115952010-07-15

Cool. BTW, do you have a laser tag plasma rifle? I would like to compare it to my plasma rifle.

Spycrab made it! (author)Spycrab2010-07-15

No, sorry. I really want a plasma rifle though. :p

charge11595 made it! (author)charge115952010-07-04

The modified piece is supposed to make it semi-auto by stopping the white connector after it releases one rubber band. A gray connector does not stop the wheel from turning after a pull, so it is automatic, releasing rubber bands until the trigger is released.

SonicX 22 made it! (author)2010-04-20

 i have made this and modded it to have the "OverHeat Lid thing" when you have empty plasma (no more ammo loaded) the top will pop up, when you load a rubberband it will go back down!

charge11595 made it! (author)charge115952010-04-24

 COOL! Please post a pic and send me the link!

SonicX 22 made it! (author)SonicX 222010-04-24

 its kinda easy to make.

i can try to tell you because i took it apart due to low rubberbands (only about 3).

1 get 2 green connectors and 3 yellow rods and 2 Y Connectors.

2. slide the green connectors on both sides on the blue rod thats above the trigger.

3. attach a yellow rod on each green connector so its facing the front of gun.

4. attach a Y connector on each green connector so its facing the top.

5. attach the last yellow rod on the Y connectors.

6. get a strong rubberband

7.load it on the gun NOTE: the rubberband must go over the yellow rod.

8. shoot.

if the steps was too hard then il make this gun again and show a picture

charge11595 made it! (author)charge115952010-04-25

I'm not too sure i got it please show me a pic, and ill add it to my ible.

SonicX 22 made it! (author)SonicX 222010-04-25

 kk il start working on it

btw: today is my birthday :D

charge11595 made it! (author)charge115952010-04-25

 Happy bday!

SonicX 22 made it! (author)SonicX 222010-04-25

 ty :D

charge11595 made it! (author)charge115952010-05-20

Made a mod based upon yours, it's in this instrucatable

SonicX 22 made it! (author)SonicX 222010-04-25

 wasnt that hard to make so heres a pic.

also im going to take it apart because i forgot to cut alittle on the Yellow Connector so it wont shoot

Photo on 2010-04-25 at 13.54 #3.jpg
vog115 made it! (author)2010-05-03

i got the trigger in lol

vog115 made it! (author)2010-05-02

how do you put the trigger in

llamadudeguy made it! (author)2010-05-02

This step is very confusing. can u add a pic from a different angle? can't understand the one that's top-down. thx

charge11595 made it! (author)charge115952010-05-02

Sorry, but my camera is out of battery, and I can't fin the charger, so I can help you nor post more instructables for a while. Try the last pic. If that doesn't help, maybe ask someone else.

davison112 made it! (author)2010-02-13

Dude, what would be cool if the top folded up(in-game reference) and that how you reload.

charge11595 made it! (author)charge115952010-04-25

 SonicX 22 made that mod in a comment above.

KnexFreek made it! (author)2010-01-31

 i have no idea how this works so i will build it :) 5 stars BTW

charge11595 made it! (author)charge115952010-03-03

The video of how to reload is on step 8.

KnexFreek made it! (author)KnexFreek2010-03-03

 i already got it... dude im no newbee..... in any way. also this is works well, 5 stars.

charge11595 made it! (author)charge115952010-02-05

 Thanks, but I need to upload a video of how to reload; )

Landon Sullivan made it! (author)2010-01-28

please explain the visual similarities between the in-game model and this.

charge11595 made it! (author)charge115952010-01-30

Try downloading the free trial or demo of "Halo: Combat Evolved" and see for yourself. :)

Landon Sullivan made it! (author)Landon Sullivan2010-01-30

News flash, I have the full version, and this looks only moderately similar.

davison112 made it! (author)davison1122010-02-13

i have the imag of alost ALL of the Halo guns brned into my mind, and.... I typed in knex gun in search bar, looked at pic and said: Sweet, a plasma pistol. then i read title.

~KGB~ made it! (author)2010-01-28


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