Introduction: M4A1 Sopmod

Picture of M4A1 Sopmod

Well, here it is. It operates on a simple rubber band loaded firing pin design, which transfers energy to the ammo after being released by the pivoting trigger mechanism. Shoots grey connecters with green rods, removable mag, pin guide, has a charging handle, and is almost completely 1:1 scale.
Have fun.


Step 1: Stock

Picture of Stock

Read the image notes. They contain the instructions.

Step 2: Reciever

Picture of Reciever

Read the image notes. They contain the instructions. The first two pictures are two views of the same thing.

Step 3: Rail System and Fake Barrel

Picture of Rail System and Fake Barrel

Read the image notes. They contain the instructions.

Step 4: Magazine

Picture of Magazine

These are detachable, internally pushed, and roofed. Read the image notes. They contain the instructions. Make as many as you can. load with One slot grey connectors with a green rod in the slot.

Step 5: Assembly.

Picture of Assembly.

Read the image notes. They contain the instructions.

Step 6: Done/Gallery

Picture of Done/Gallery

Here's your cookie. Use the band on the trigger guard to band the mag release if you haven't already done so. Band the Pin however you want. With 1 string of 2 #64s, I got a nice 30 feet. Have fun! If you make this, I will post your pic on this step. if you have a nice attachment you want in the 'ible, I'll make a step for it.


knexgunfreak781 (author)2013-05-09

are the m4s real

knexboy586 (author)2012-09-26

i have the same cookie in one of my ibles

CuddlesMcT (author)2012-04-08

anyone having a problem where it shoots one bullet and ejects another at the same time?

CuddlesMcT (author)2012-04-07

The magazine pissed me off so much, but i finally finished it haha. This gun shoots great! 5 stars.

PotatoCoffee (author)2012-01-05

Why did you reply to me?

lol. What did the comment say?

I can't remember.

ok, cool.. maybe it was an annoying little kid

ooocol22 (author)2012-02-10

Does it use many red connectors

AUG-5OM3 (author)2012-01-21

How much snowflakes/blue 3d's does this gun need?

dr. richtofen (author)AUG-5OM32012-01-24

Als ik goed heb geteld: 26 witte en 12 blauwe verbindingselementen.

AUG-5OM3 (author)dr. richtofen2012-01-25

Dankje ik zat rond hetzelfde getal ;P

dr. richtofen (author)AUG-5OM32012-01-25

Geen probleem :)

PotatoCoffee (author)2011-12-10


MegaMetal8 (author)2011-09-26


You coming back now?

rec0n (author)MegaMetal82011-09-26

Thanks! Idk, k'nex kinda bores me. nothing new worth making I guess.

MegaMetal8 (author)rec0n2011-10-01

Same, I come on like every 2 weeks and its just becoming less and less.

beanieostrich (author)2011-09-24

The mech seems to be problematic, it wont cock properly.

rec0n (author)beanieostrich2011-09-26

Try using a different rubber band/banding method on the blocker. Or, try modifying the blocker.

beanieostrich (author)rec0n2011-09-26

Thank you, that helped =) My version shot about 46 ft on average with 4 # 64s on it. But sadly I destroyed it; although i have kept your amazing trigger guard and pistol grip for my new Compact Shotgun aka BCS2.

rec0n (author)beanieostrich2011-09-27

Np. It's good to know that this can get decent range for a repeater. Thanks for trying it out!

beanieostrich (author)rec0n2011-09-27

Your welcome.

knex mad (author)2011-09-27

=O "claps in Amazement" this is very good looking, sleek , tidy im going to build after ive got my enrty sorted for the jamalams competition still just =O

rec0n (author)knex mad2011-09-27


~KGB~ (author)2011-09-23

Heres the magazine:

rec0n (author)~KGB~2011-09-26


~KGB~ (author)rec0n2011-09-27

Thanks =D just need to make the stock and sopmod =D

Seleziona (author)2011-09-23

I like this type of ammo very much. May consider building. Nice job!

rec0n (author)Seleziona2011-09-26


The Chunky Sniper! (author)2011-09-22

Nice airsoft collection.

rec0n (author)The Chunky Sniper!2011-09-22

Thanks! Those pics are from a while back, My collection has grown quite alot since then.

The Chunky Sniper! (author)rec0n2011-09-24


Oblivitus (author)2011-09-22

As I said before, great job on making an accurate model.

rec0n (author)Oblivitus2011-09-22


Oblivitus (author)rec0n2011-09-23

You're welcome. :)

~KGB~ (author)2011-09-22

Nice one =D

rec0n (author)~KGB~2011-09-22

Thanks! Are you interested in helping make a SOPMOD kit?

~KGB~ (author)rec0n2011-09-22

Sure thing, when the gun is done ill do an ACOG, RDS/holosight, silencer possibly, and maybe a HBS.

rec0n (author)~KGB~2011-09-22

Alright, cool.

~KGB~ (author)rec0n2011-09-23


dr. richtofen (author)2011-09-22

sweet! how many yellows does it use though?

rec0n (author)dr. richtofen2011-09-22

Thanks! Not many, alot less with current version.

dr. richtofen (author)rec0n2011-09-22


dr. richtofen (author)2011-09-22

maybe make the o so well known carrying handle

rec0n (author)dr. richtofen2011-09-22

Nah, no carry handle sight for this. I hope to put a front flip sight, 551 holosight, VFG, PEQ-7, and some rail covers up later today though.

dr. richtofen (author)rec0n2011-09-22


Senior Waffleman (author)2011-09-22


rec0n (author)Senior Waffleman2011-09-22


Senior Waffleman (author)rec0n2011-09-22


The Nomlack (author)2011-09-22

Amazing! I am building it right now! Its now my favourite gun on KI, and Instructables! Do you have a video?

About This Instructable




Bio: I'm an intermediate knexer who builds replica guns and performance guns. If you would like me to make a replica of a gun, just ... More »
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