Introduction: Masterdude Assault Rifle (MAR)

This is a rifle I made. It is a (very) upgrade version of one I had a long time ago in this slide show.

-Actual Semi-Auto
-Has a magazine(holds 13 bullets)
-Good range, strength, and accuracy (depending on the rubber band used)
-Good looks
-Easy to modify
-Carry handle
-Has a safety
-Can be disassembled for easy storage
-True trigger

-Uses quite a lot of pieces
-Can take some time to reload
-Is rather large

More Instructables by me.

Step 1: List of Parts

Here is a list of parts used in the MAR:


-Light Gray-12
-"Y" Connector-4
-Metallic Blue-3


-Small Square-2



Note-This piece count does not include ammo and might have some mistakes.

Step 2: Barrel: Making the Components

Make the following:

Picture 1: Make 2.
Picture 2: Make 2.
Picture 3: Make 14.
Picture 4: Make 14.
Picture 5: Make 14.

Step 3: Barrel: Construction

Follow the images:

Picture 1: Attach 4 gray rods as shown.
Picture 2: Add the earlier constructed pieces.
Picture 3: Add another piece like the first.
Picture 4: Again add the earlier constructed pieces but the places are switched.
Picture 5: Repeat the stacking until you end up with this.
Picture 6: Take the earlier constructed piece and add a blue rod.
Picture 7: Add 3 yellow connectors.
Picture 8: Attach the other identical piece.
Picture 9: Put a blue rod with a gray connector in the place shown.
Picture 10: On the other side place a light gray connector as shown.
Picture 11: Attach a blue rod to one of the left over pieces you've made.
Picture 12: Attach the other left over piece as shown.
Pictures 13 & 14: Finished barrel.

Step 4: Magazine/ Ammo Feed: Making the Components

Make the following:

Picture 1: Make 2 of these.
Picture 2: Make 2 of these
Picture 3: Make 1.
Picture 4: Make 1.
Picture 5: Make 1.
Picture 6: Make 1.
Picture 7: Make 1.

Step 5: Magazine/ Ammo Feed: Construction

Follow the images:

Picture 1: Place the blue and white rods where shown in the picture.
Picture 2: Place the earlier made parts as shown.
Picture 3: Attach the other part over the rest as shown.
Picture 4: Place white rods as shown in the picture.
Picture 5: Place the earlier made part as shown.
Picture 6: Add 2 gray connectors as in the picture.
Picture 7: Place white rods with tan clips.
Picture 8: Place the earlier made part as shown.
Picture 9: View from other side.
Picture 10: Top view.
Picture 11: Place it as shown.
Picture 12: On the other side place the left over part as shown.
Picture 13: When finished it should look like this (Ammo pusher is in place).

Step 6: Trigger System: Making the Components

Make the following:

Picture 1: Make 2.
Picture 2: Make 2.
Picture 3: Make 1.
Picture 4: Make 1.
Picture 5: Make 1.
Picture 6: Make 2.

Step 7: Trigger System: Construction

Follow the images:

Picture 1: Place blue rods where shown.
Picture 2: Other side: Place tan clips as shown.
Picture 3: Place the earlier made part(with white rod) and spacers as shown.
Picture 4: Add the other parts and spacers and connectors as shown.
Picture 5: Place earlier made parts and spacers as shown in the image.
Picture 6: Place the earlier made part over the rest.
Picture 7: Add blue clips where shown.
Picture 8: Place the earlier made parts as shown.
Picture 9: Add light gray and red connectors.
Picture 10: Add the remaining part.
Picture 11: Finished.

Step 8: Stock: Making the Components

Make the following:

Picture 1: Make 2.
Picture 2: Make 8.
Picture 3: Make 12.
Picture 4: Make 4.

Step 9: Stock: Construction

Follow the images:

Picture 1: Attach 4 gray rods to the part shown.
Picture 2: Place 2 orange connectors where shown.
Picture 3: Repeat it until you get this.
Picture 4: Place the earlier made part as shown.
Picture 5: Add orange connector and spacers.
Picture 6: Add the earlier made parts.
Picture 7: It should look like this.
Picture 8: Place blue rod where shown on the earlier made part.
Picture 9: Place the earlier made parts as shown.
Picture 10: Place the other earlier made part over the rest.
Picture 11: Put the 2 together so it looks like this.

Step 10: Putting Everything Together

Follow the images:

Picture 1: Put the stock and trigger system together.
Picture 2: Put the barrel, magazine/ammo feed, and stock/trigger system together as shown in the

Step 11: Loading and Firing

The rifle shoots the ammunition shown in the first picture. The next two pictures show the rubber band placement. The last image shows how the ammo feed should look when loaded.

Warning- This may cause harm or injury if misused. Do not point it at people. I am not responsible for damage, injury, or death caused by this instructable.

Step 12: Upcoming Upgrades

Here are some modifications, additions, and upgrades:

-Gray connector firing mod.
-Under-barrel grenade launcher.

And here are some which I might post:

-Removable mag version


Knex.X made it!(author)2012-10-16

There is no way that ANY OF YOUR GUNS will be able to shoot properly.

Masterdude made it!(author)2012-10-17

Why do you say that? I have made dozens of them and to me they sure seem to shoot "properly".

Knex.X made it!(author)2012-10-18

Well, nothing personal but the 'semi auto' mech of yours jams alot.
Elastics may pass the bullet.

Masterdude made it!(author)2012-10-21

Well, this is an old model (about 3 years old) which had its faults which I have done my best to fix. I have not noticed any jams in my last couple semi automatics, and as for the the elastic passing the bullet, the rod behind the ammo feed feeds the rubberband at a height at which it will catch on to the bullet.

Knex.X made it!(author)2012-10-24


Gary+A made it!(author)2010-11-25

I was making this, and I was wondering if it is correct that the rubber band flies off each time I shoot.

shieldsam made it!(author)2010-11-30

Snap a white rod into where the rubber band goes into


Masterdude made it!(author)2010-11-26

It's OK. However if you don't want then to fly off I'm sure you'll manage to modify it so they stay connected to the gun. Also you may want to know that this I'ble is outdated for the MAR-3 was posted already.

Gary+A made it!(author)2010-11-26

Thanks Masterdude. You are a Master Dude!

Masterdude made it!(author)2010-11-27

You are welcomed.

%7EKGB%7E made it!(author)2009-11-30


Fred+the+evil+puppet made it!(author)2010-07-27

you say nice to every cool thing. the MAR, the box grenade posted by my best mate, ect ect.

%7EKGB%7E made it!(author)2010-07-28


Mr.+Muggle made it!(author)2009-12-01

Is this a real semi auto? Not just a gun with a magazine? Cause that's really cool!!

DJ+Radio made it!(author)2009-12-15

Pseudo semi auto.

Mr.+Muggle made it!(author)2009-12-16


DJ+Radio made it!(author)2009-12-16

Guns like this are pseudo semi auto.  The mech has been done before.

Mr.+Muggle made it!(author)2009-12-16

yeah but what's pseudo Semi auto

Masterdude made it!(author)2009-12-01

It is actual semi-auto so you just have to pull the trigger to shoot.

Mr.+Muggle made it!(author)2009-12-01

That's sweet!

DJ+Radio made it!(author)2009-12-15

S0lekill3r made a pseudo semi auto on Youtube, works just like this one, except the handle is better and its sturdier.

knexguy made it!(author)2009-12-15

Not bad, but needs a lot of work to make it good.

Raikou-san made it!(author)2009-11-30

I like how you made an RBG shoot connectors. Nice.
My only complaint is that it needs a real handle and maybe a sturdier body.

Masterdude made it!(author)2009-12-01

I have make a new handle and I hope on posting it over the weekend.

Raikou-san made it!(author)2009-12-02

Would you mind if I used your trigger mech? I would love to make a good, solid good using it.

Raikou-san made it!(author)2009-12-02

Oops. I meant to say: "I would love to make a good, solid gun using it." :P

Killer%7ESafeCracker made it!(author)2009-12-01

I Iike it. I think you could of done better on the handle, but good over all. 4.5

Masterdude made it!(author)2009-12-02

I've made a new handle and over the weekend I hope to post how to make the handle better.

Killer%7ESafeCracker made it!(author)2009-12-02


Seleziona made it!(author)2009-12-02

it's bent in the picture....

Masterdude made it!(author)2009-12-02

It kind of is because it's rather heavy and the connection between the parts might not be the ideal one but at least it lets it be disassembled easily for easy storage.

Seleziona made it!(author)2009-12-02

ohh, okay.....

Mr.+Muggle made it!(author)2009-12-01

MAR? That's the name of my tank!! I don't really mind though

About This Instructable




Bio: I make K'nex guns, specializing in semi-automatic, RBG-Slingshot hybrid systems which i use in most of my guns. Note: I am not responsible in ... More »
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