Introduction: K'nex Thompson SMG

Picture of K'nex Thompson SMG

This is my Thompson SMG. Includes true trigger and bottom fed grey connector magazine. Obviously modeled after the Real Thompson SMG used in WW2, this is one of my best shooting guns. It fires dark grey connectors (the one-way kind) and gets about twice the range of my TMG (my side-arm). It holds over 10 shots comfortably, you could get 15+. Other than the magazine which has been used by just about everyone, everything on this gun is made by me. PS - Follow the sticky notes throughout the instructable to get through the tricky spots.


- Good range
- Fast firing (cock, fire, repeat)
- Good looks
- Small and compact


- A little bit flimsy in some spots, but nothing huge
- Inconsistant range, i.e. 1 shot goes 30 ft, next goes 40 ft, next goes 35 ft, etc.

Step 1: Stock

Picture of Stock

Let's go right into building. This is the stock, made straight instead of the weird angle in the real fire-arm to give it more strength. This is a very simple step.

Pic 1 - Just make exactly what you see (the first layer) 3 times and connect them with white rods. It should be 3 layers thick

Step 2: Rear Portion of the Barrel

Picture of Rear Portion of the Barrel

This aligns the ram rod, and most importantly contains the ram blocker.

Pic 1 - The finished product

Now start building...

Pic 2 - Left side view
Pic 3 - Top view
Pic 4 - Right side view
Pic 5 - Bottom view

Now make the sights...

Pic 6 - Easy, make it
Pic 7 - Attach it like so...
Pic 8 - And so

Step 3: Handle + Trigger

Picture of Handle + Trigger

A strange trigger design, but effective.

Pic 1 - Make both these parts
Pic 2 - Attach them
Pic 3 - This is the handle and all the layers are the same except for the middle one...
Pic 4 - ...Which has a 2 way grey connector as seen in the picture
Pic 5 - Ready to attach the 2 parts
Pic 6 - Attached by both grey connectors
Pic 7 - Another view

Step 4: Barrel System and Magazine

Picture of Barrel System and Magazine

Pic 1 - Make this
Pic 2 - Make each of these x1
Pic 3 - Slide them onto the blue rods
Pic 4 - Next one slides onto the blue rods and clips into the yellow connectors
Pic 5 - Slide on the next one
Pic 6 - Magazine
Pic 7 - Different view
Pic 8 - Build these (Very difficult)
Pic 9 - Attach them onto the mag as follows
Pic 10 - Attach it onto the Barrel system
Pic 11 - Clip on that piece I told you about in the yellow box on the 2nd step.

Step 5: Front End and Front Sight

Picture of Front End and Front Sight

The first time I saved this, the next page didn't open so now I have to re-do it! Has that happened to anyone before? Anyways...

Pic 1 - Build it
Pic 2 - Another view of Pic 1
Pic 3 - Build it
Pic 4 - Another view of Pic 3
Pic 5 - Attach the 2 together
Pic 6 - Side view of the 2 attached

Step 6: Ram Rod and Mag Push

Picture of Ram Rod and Mag Push

Probably the hardest step of the whole instructable

Pic 1 - Make them
Pic 2 - other view

Step 7: Assembly + Rubber Bands

Picture of Assembly + Rubber Bands

Enough with the building, let's attach it all together. I didn't get a piscture of it, but just attach the front barrel and fron sight directly onto the front of barrel and magazine

Pic 1 - Handle + Barrel and magazine
Pic 2 - Attached
Pic 3 - Trigger looks like this
Pic 4 - Rear Barrel + Front Barrel
Pic 5 - Attached
Pic 6 - Attached + Close-up of trigger
Pic 7 - Stock + Rear Barrel
Pic 8 - Attached
Pic 9 - Ram rod goes in
Pic 10 - Ram rod rubber bands
Pic 11 - And they go on like this
Pic 12 - Trigger rubber band - Key to keeping the trigger in place so it doesn't slide off.

Step 8: Loading and Firing

Picture of Loading and Firing

Last Step!

Pic 1 - Put bullets in the bottom of the magazine
Pic 2 - Ram rod goes in like so, and the rubber band also goes like so
Pic 3 - Aim and Fire!


sandmman (author)2012-05-19

Not brilliant but not bad at the same time, keep at it :)

knexinventer (author)2012-01-07

my Thompson airsoft

beanieostrich (author)2011-03-07

Doesnt looks very much like a Tommy Gun.

ive got an instructable on how to make a drum that works for this gun

I dont see the 'ible. You must not have posted it yet.

srry i havent yet

Ill wait for it.

oh wow im a moron the drum i made isnt even for THIS thompson.Its for a different thompson and im posting it june 1st

that obviously didnt happen. XD

Sounds cool =D

it actualy does. theres 3 versions of the tommy, this bieng the one used in World War 2

Its still not the best looking tommy gun on this site though.

Fred the evil puppet (author)2011-10-24

i have an idea for a drum mag... hehehe.

rheath2 (author)2011-08-20

It's awesome!...................................Now I understand how to make it!

LilWhiiteBoyy (author)2011-08-16

I ran out of ORANGE!!!

gassybeans (author)2011-06-08

wow, TRAUTS this is the first gun ive made by u that actually fires the bullets more than 2 feet! this one shoots 10. IMPRESSIVE!

15csmith2 (author)2010-03-24

Dude just don't make the part of improvise. I hardly ever get to make a full gun

gassybeans (author)15csmith22011-06-08

ur not the only 1

PiTBuLL892 (author)2009-10-18

at first i thought "on no, not another trigger that will always jam" but it works excellent!!!!

how do u get it 2 work?

steastiw (author)2011-03-19

should havee drum mag and another handle

kermit127 (author)2010-11-06

it shoots two and breaks easily its a fail

Danny4878 (author)kermit1272011-03-05

epic fail whale!!!!!!!!!

Danny4878 (author)2010-11-06

It didnt shoot properly and the bullets kept on falling out the front of the gun. 1/2*

joey99 (author)2010-07-19

could you make a drum for looks

knex inventor (author)joey992010-09-20

that would be good!

spijk860 (author)2010-07-31

cool thopson

Fred the evil puppet (author)2010-07-24

great pics!

knex obsessed (author)2010-05-21

this gun is awsome looks like the real gun nd also i suggest you tape the trigger as it is easier to fire but apart from that it is the best

mechaninja (author)2010-05-07

Please only comment on the current weapon's topic.

DontShoot262 (author)2010-05-05

does this gun require moded pieces, pleace answer

15csmith2 (author)2010-03-24

Sorry mistype, I ment just don't make the part OR improvise. And don't make the stock.

jellybean10122 (author)2009-01-13

Thompson M1A1 Military Version. To be exact.

gunman94 (author)jellybean101222009-06-05

Yeah, the M1928 was the Thompson with the drum Magazine. The GI's thought that the drum rattled too much though so on later models it was not used. Yeah this the M1A1 Military they're like $2,000 now. Have like a WWII re-enactment with this and Trauts Machinen Pistole Vierzig (MP40)

ditty do (author)gunman942010-02-10

The germans had alot of trouble naming weapons.Usually they just used the german word for what ever type of weapon it was and put whatever year it was introduced into production.Example:MachinenGewher 1942.A.K.A. Machine Gun 1942.A.K.A. MG42'.The germans were smart people but werent very good at coming up with names.

rrr67 (author)2009-01-28

no offense to you or anyone else but this gun sucks because how the hell do u expect me to load it if you don't explain the whole process!!!!!!!!!!

barrax (author)rrr672009-02-21

just thinking, but some people would label you as a 'noob' if you think thats a good question. put the bullets in the mag, push them up, pull back the pin, pull trigger. easy ain't it?

rrr67 (author)barrax2009-11-15

yeah. btw ya dont have 2 sound like a smartass when u tell me how im classified, 4 all i care u can go hump a stick!!!!

barrax (author)rrr672009-11-16


dont talk bout ur mom like that , and btw, i would "not like" this, but...

rrr67 (author)barrax2010-01-17

kk i figured out how 2 load it and im sry i called u a smarta**

barrax (author)rrr672010-01-17

lol thats ok

sry bout the mom joke :S

friends ?

rrr67 (author)barrax2010-01-17


ajleece (author)rrr672009-01-31

because you use your common sense

HNA724 (author)ajleece2009-02-07

What rods does it shoot

ajleece (author)HNA7242009-02-07

gray connectors

Oblivitus (author)2009-11-19

Hey guys, check out the Thompson that I'm working on.

Trauts (author)Oblivitus2009-11-19

Bomb! Msg me when you finish it

matsermetsuiker (author)Trauts2010-01-07

 me too!!!

About This Instructable




More by Trauts:K'nex MP5K'nex Thompson SMGTrauts' Side-Arm - TMG
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