Introduction: K'nex MP40

Picture of K'nex MP40

This is my K'nex MP40 that I just finished making. I was looking for a gun that no one had made before and this was the first one I found, so I decided to go right ahead and make it.

The only copied part is the trigger from TheDunkis's AK47 and i modified a little bit his handle.

This is my first instructable so lots of constructive criticism!


- Small, Lightweight
- Durable
- 25+ round magazine
- Easy Firing
- Looks Cool


- Low range

Step 1: Handle

Picture of Handle

1-Handle (Side)
2-Handle (Front)
3-Trigger Guard

Step 2: Lower Reciever

Picture of Lower Reciever

1-Lower Reciever (Side)
4-TheDunkis's Trigger
5-Trigger + Lower Reciever
6-Ready to put together handle and lower reciever

Step 3: Upper Reciever/Barrel

Picture of Upper Reciever/Barrel

1-Left Side
3-Right Side
5-Ready to attack to lower reciever
7-Close up of trigger placement

Step 4: Magazine

Picture of Magazine

1-Assembled Mag
2-Standard green rod magazine
3-Top Piece
4-Different View
5-Attached Top Piece and Green Rod Magazine
6-Ready to attach magazine to upper reciever

Step 5: Front Barrel Assembly

Picture of Front Barrel Assembly

1-Left Side
5-Ready to attach to upper reciever

Step 6: Firing and Rubber Band Placement

Picture of Firing and Rubber Band Placement

1-Magazine Push and Ram Rod
2-Magazine Push and Ram Rod in proper places
3-Trigger Rubber band goes around the rear sight
4-Ram rod Rubber band goes up to the Front Barrel Assembly
5-Magazine Push Rubber band goes around the bottom white rods and over the bottom of the pusher

Step 7: Loading and Firing

Picture of Loading and Firing

1-Load the green rods into the magazine. Fill to your hearts content
2-Push the Mag Push in then apply it's proper rubber band ( as seen in the previous step)
3-Pull back the firing pin till it locks into place
4-Take aim with the sights and FIRE!!!


gabriel180 (author)2014-03-16


Kona-chan (author)2013-06-04

gonna make it right now

knexboy586 (author)2012-09-29

one of my favorite guns in medal honor heros

stryker3 (author)2011-06-21

cool! I think i will make a stock for it

rheath2 (author)stryker32011-11-27

I already did that

rheath2 (author)2011-09-22

Trauts, typ in mp40 stock. Comment

rheath2 (author)2011-09-04

I've made that gun....................................................................AND I STILL HAVE IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

stryker3 (author)2011-09-01

O yeah, and your profile picture looks EXACTLY like the sample picture for the koala on the computer!

rheath2 (author)2011-08-03

I sort of.......IMPROVED it.

irish dc 95 (author)2011-08-01

nice!!!!!!! I had enough to make ur thompson and ur mp40

chato56 (author)2011-07-06

how do you put the rods in

gassybeans (author)2011-06-19

you can actually stop here, but then its not an mp40!

seniorpancakeman (author)2011-05-07

you should give up making shooting guns. just make models. these guns you post stink but they look really good. :(

dont listen to him. some of your guns are great.

knexinventer (author)2011-04-17

made it again and it dose not work no matter what i do

dont feel bad ,the mag doesnt work.

beanieostrich (author)2011-03-22

My MP-605 SMG performs better than this gun.

Danny4878 (author)2011-03-05

Didn't shoot well..... probably just my dodgy visual capabilities (what ever that means). Still a pretty awesome gun, i customized the mag so it could be removed but not enough pieces for another mag. >:-(

poellmac (author)2010-10-06

couldnt make the mag work. plz help some one

poserboy123 (author)poellmac2010-12-22

well judging by the pics it doesnt look like the mag is supposed to work:)

orckyorca (author)2010-10-29

doesn't shoot very far... :(

poserboy123 (author)orckyorca2010-12-22

yeah look at my post

poserboy123 (author)2010-12-22

no one can do anything stupid with this gun when it only shoots 4 feet

gers2010 (author)2010-12-22

kl gun used it in a knex war and i won whoooooo:)

knex inventor (author)2010-10-28

im a smart person ill only shoot it at my sisters eye! lol

loonley (author)knex inventor2010-12-12

i shot at my stupid neighbors!

Miles Tails Prower (author)2010-09-04

"OUR HOUNDS WILL TEAR ZEM TO SHREDS!!11" (only funny if you play(ed) cod waw). Pretty nice, I think i'll have a go at one too. With my patented (not really xD) mag system.

smithinator (author)2009-07-05

how far does it shoot

opyl (author)smithinator2010-08-14

hey you do alot of good guns.. you should do the ppsh 41 again and the M16A4 both good locking good guns. make the instructions for thm., tht would be cool.. :)

opyl (author)2010-08-14

hey ive just finished it.. how deos it shoot.?~

knexinventer (author)2010-08-05

i made it half a year ago and i like it but i stick a grey rod with a nerf dart on the tip

spijk860 (author)2010-07-23

you got really nice guns like this

michealjacksonfan23 (author)2009-07-21

what does it shoot

green rods

wats-a-username (author)2010-06-07

i like it except for the triger no offense to the dunkis but i never liked tape

D1rty Di3sel (author)2010-05-18

Is it OK if I mod this into an Agram 2000?

thebair (author)2010-05-08

Im making it when I get more knex.

DrWeird117 (author)2008-07-15

what is that piece after the 5th white connector?

Trauts (author)DrWeird1172008-07-15

It is a black piece that looks like a chopped off grey connector

grotle1231 (author)Trauts2010-03-12

you can also use a sawed off orange connector

TOMNDAN (author)Trauts2009-11-04

this shoots only 2-3 feet or somtimes it wont even exit the barrel

happybirthday (author)Trauts2009-01-22

it says 'Ready to attack lower receiver" on #5

master of knex (author)2010-01-10


jasper4 (author)2009-11-25

it says low range

JIMMY12345 (author)2009-11-01

 Its a good idea. I like the way it connects to the gun.

Killergunman (author)2009-10-03

this looks cool good job for a first!!

juneapaluna (author)Killergunman2009-10-04

lol, for a first?

stopanator (author)2009-09-11

removable? i mean the clip is it removable is it a removable clip

Anti flame1 (author)2009-09-05

I just moded it to be a no jam magazine and it shoots around 70 feet!

About This Instructable




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