Introduction: The Ultimate Knex (Autoload) Rifle

Picture of The Ultimate Knex (Autoload) Rifle
So this is my favorite design of all my knex rifles and the first one i have posted on this site. This rifle uses a hopper to reload. I usually made my hoppers out of a plastic or cardboard material which worked very well. But oodalumps had a hopper that used all knex pieces so I just borrowed his idea with slight modifications.

Step 1: Construct Firing Pin

Picture of Construct Firing Pin

1 black/grey rod
2 blue rods

1 red connector
1 grey connector
1 blue and purple joint connector

Step 2: Construct Back Handle

Picture of Construct Back Handle

4 green connectors
2 blue and purple joint connectors
3 red connectors
2 orange connectors
12 yellow connectors (as many or few as you want)

4 green rods
5 blue rods
2 red rods
3 white rods

Step 3: Construct Ammo Hopper

Picture of Construct Ammo Hopper

12 grey connectors
2 light grey connectors
4 orange connectors
2 white connectors

5 yellow rods

Step 4: Construct Barrel (part 1)

Picture of Construct Barrel (part 1)

15 peach connectors
1 orange connector
4 yellow connectors

3 red rods

Step 5: Construct Barrel (part 2)

Picture of Construct Barrel (part 2)

add a grey rod connected to a orange connector to the step 4 barrel

picture shows bottom view

Step 6: Construct Barrel (part 3)

Picture of Construct Barrel (part 3)

add 11 grey connectors to fill in the gaps in the barrel

Step 7: Construct Trigger

Picture of Construct Trigger

1 orange connector with rubber band slipped through hole
2 grey connectors

1 blue rod

Step 8: Add Trigger to Barrel

Picture of Add Trigger to Barrel

connect the blue rod to the orange connector of the barrel. connect it so that the orange connector of the trigger is separated by the orange connector of the barrel by the two grey connectors

Step 9: Construct Front Handle (part 1)

Picture of Construct Front Handle (part 1)

2 white connectors
3 orange connectors

2 yellow rods
2 blue rods

Step 10: Construct Front Handle (part 2)

Picture of Construct Front Handle (part 2)

add two more red rods on either side of the original red rod

Step 11: Construct Connection of Handle to Barrel

Picture of Construct Connection of Handle to Barrel

two objects:
1 light grey connector
2 yellow connectors

5 green rods
1 grey rod
1 red rod

1 light grey connector
2 red connectors

5 green rods
1 grey rod

Step 12: Connect Step 11 Objects to Barrel

Picture of Connect Step 11 Objects to Barrel

turn barrel upside down and place step 11 objects next to it like the picture.

connect green connectors of the step 11 objects pointing toward barrel to all but one of the barrel's yellow connectors. The green connectors will connect to the diagonal claws of the yellow connectors

Step 13: Connect Handle to Barrel

Picture of Connect Handle to Barrel

connect step 10 handle to the barrel. The light grey connectors on the barrel are at the front of the gun. So place the step 10 handle with the white connectors connecting to the green connectors of the barrel. The yellow rods of the handle should be pointed toward the front of the gun.

Step 14: Connect Hopper to Barrel

Picture of Connect Hopper to Barrel

This step is easy. Simply connect the orange connectors of the hopper to the red rods of the barrel. Put the orange connectors in the gaps of the peach connectors. There should be three peach connectors inbetween the orange connectors of a side and two peach connectors on the outside.

Make sure that the light grey connectors are close to the back orange connectors (not the front orange connectors)

Step 15: Construct Wheel System

Picture of Construct Wheel System

This is optional but recommended.

First construct two small objects as the first picture shows.
Each small object has:

2 orange connectors
2 red connectors

2 white rods

Then construct the wheel hold which consists of:

2 red connectors

2 white rods
2 blue rods
1 yellow rod
2 small wheels

Connect the two small objects to the wheel hold as shown in the second picture

Step 16: Connect Wheel Hold to Barrel

Picture of Connect Wheel Hold to Barrel

The orange connectors of the wheel hold will be connected to the yellow rods of the handle (step 9,10)
Connect them so they are next to the three orange rods on the handle. Then connect the two white rods of the wheel hold to the light grey connectors of the hopper

The second picture (although blurry) shows sentences 1 and 2

Step 17: Connect Back Handle to Barrel

Picture of Connect Back Handle to Barrel

Connect the step 2 back handle to the barrel.

Connect the green connectors of the back handle to the blue connectors of the front handle (step 9,10)

Then connect the top blue and purple joint connector of the back handle to the grey rod coming out of the back of the barrel

Step 18: Connect Rubber Bands

Picture of Connect Rubber Bands

Connect the rubber band of the trigger to the closest blue rod of the front handle (part 9,10). Depending on the strength of the rubber band you might need to wrap it around the blue rod several times so its tight (1st picture)

Then put two rubber bands on firing pin so they are encircling the blue rods (2nd picture)

Then slip firing pin in barrel with grey connector (the hole part of it) of pin sliding in the grey rod shown in step 17. Wrap the rubber bands of pin around the wheels (3rd picture) and then slip on the tip of the two highest red rods of barrel (4th picture)


CODKING (author)2010-06-30

awsome gun but i dont like the trigger could be better

ILIKEPIE333 (author)2008-11-13

can some one build this?

_kira_ (author)ILIKEPIE3332009-11-09

Ok this comment is a year late but would the chainsaw have to be motorized?
Pre ferably not because shooting a chainsaw with my motor on it isnt my favorite thing to do.

ILIKEPIE333 (author)_kira_2009-11-14

there is an electrical mechanism that ignites the chainsaw motor after it leaves the launcher

knex_mepalm (author)ILIKEPIE3332009-10-21

RPC, lol, thad be hard fitting a motor into that chainsaw, so tiny. Im making a rocket propelled knife launcher thingamaboogiglydaboo. Im making knex then a real one

KnexFreek (author)ILIKEPIE3332009-09-30

lol times 10000000 no jk im not dj

An Villain (author)ILIKEPIE3332009-09-15

if someone built that i sure would build/buy one.

noremac258 (author)ILIKEPIE3332009-02-01


ILIKEPIE333 (author)noremac2582009-02-01



CrazyCHRIS!! (author)2008-10-01

'But oodalumps had a hopper that used all knex pieces so I just borrowed his idea with slight modifications.'

I love this phrase, I JUST borrowed this. You know I JUST invaded poland for no apparent reason, I JUST dropped a nuclear bomb on Nagasaki and to finish it off I'm on my way JUST dropping another on Horoshima!

You would think this comment would have a point, would'nt you? Well your wrong because it does'nt, I'll just carry on talking... ... ... BLAH ... ... ... BYE ... ... ...

knex_mepalm (author)CrazyCHRIS!!2009-10-21

Hey my avatar, lol. I love it its awesome

its cool though

rik3098 (author)2009-08-28

LOOK LOL ╚♦☻♠▼:

zap89 (author)2008-05-16

hey guys, whats a hopper?

mrbox (author)zap892008-05-22

A hopper is a bucket that holds ammunition which uses gravity to pul the bullet down to where the firing pin will move through... launching the bullet... If you play tennis you'd know that a ball hopper is similar to a hopper on a knex gun...

mashedpotato13 (author)mrbox2009-03-23

Er, no, not quite, it actually loads directly into the barrel.

zap89 (author)mrbox2008-05-24

oh right thankyou

Oompa-Loompa (author)2008-07-16

is this just a pull-back-the-pin-and-pull-the-trigger gun or is there something I KNOW will make me want to build it? Even if that's all it is, kudos on the design it looks snazzy. lol, snazzy

there is something about this gun that makes you want to use the word snazzy about it.

No no no, after further inspection, I've realized that it's not even as good as a pull-back-and-pull-trigger gun.

mettaurlover (author)2008-08-23

you seem to forget about the existence of white gray length rods: stronger than black.

ILIKEPIE333 (author)mettaurlover2008-11-13

that is what he has, and they are the same thing

and harder to find.

zebrahotline (author)2008-07-09

love this gun, a must make

koolkidd (author)2008-02-15

I just built this again and I like it better the 2nd time!

hopey47 (author)2008-01-08

awsome gun but i tried to put a true trigger on it by attaching stuff to it but fail could somebody give me a instructable on how o give this gun a true trigger

buterSBob29 (author)2007-10-21

ok yea

its seriously been a long time but i just got more pieces and now i just finished it and its the best

Keh!Nex (author)2007-07-25

Nothing new. Nearly everyone makes K'nex guns with a hopper. Though, yours has an innovative design not much like others. I'd say this this is a 8/10.

Mad Cat (author)Keh!Nex2007-09-03

Remember that this is one of the first guns with a hopper.

Metal4God (author)2007-05-29

this thing is awsome it is the best auto load rifle thx macbeasty :)

Metal4God (author)Metal4God2007-08-04

jayme said that not me but its still cool

stickylaffytaffy321 (author)2007-06-05

Verry verry verry good gun. nice design i kill my bro with it. (we are having a knex war right now) lol

HUH MURDER! lol :)! (author)2007-07-26

i destroyed it lol cus it broke most of my rubberbands grr...! (author)2007-07-25

i built but a lot of pieces keep breaking off.and umm wats the range of this gun

buterSBob29 (author)2007-07-12

this sucks, i dont have anough pieces for it(i just built tons of other guns!)

AlbinoBlackSheep (author)2007-06-20

my dad works 169 hours a week. (there are only 168 in a week) it's kinda like the beatles song "8 days a week"

dskater77 (author)2007-06-07

this is the BEST knex gun ive ever built!!!!!!! hope you build more!!!

bear_cat (author)2007-04-20

this gun rocks it is my favorite i have made and the simpliest good rifle have found i hope u post more!!!!!

ropple07 (author)2007-04-09

how meny can it hold

9 blue rods

Knex Rules (author)2007-03-20

Hey since no1 answered my question i spent ages and fixed it. It is absoloutely amazing but occasionaly nothing comes out and then two fall out

macbeasty (author)Knex Rules2007-03-28

Hey i sent someone a private message regarding jamming and it might have been you but i forget now so check your inbox although you said you already fixed it. BTW just wondering what was your problem and how did you fix it?

knexbldr888 (author)macbeasty2007-04-02

this thimng is awesome!!!!! it was really easy to build. sometimes it jams but a little shake and it works again. it is my 2nd favorite gun (behind my gatling gun)

knex hater hater (author)2007-03-25
ive made a video of me fireing it if the other vid is down but the gun keeps jamming. its kool aleast . also sorry the sound isnt in sync.
knex hater hater (author)2007-03-25

wow i just bought the 400 tub yesterday and built this gun and it was amazing. the wheel system reduces tention and its really upgradeable good work

knex hater hater (author)2007-03-19

omg omg omg this is the best gun ever that ive built. i dont have alot of knex but my friends little bother has a whole tub and i built it out of his and had to destroy it but it was the first auto gun ive built cause i had enough parts

Knex Rules (author)2007-03-16

Hey man i love your gun but it keeps jamming when i pull firing peice back, ive shaked it yet it makes no difference and still gets stuck HELP plz

macbeasty (author)2007-02-28

k the video is back up

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