Introduction: MSAU-2

Picture of MSAU-2

This is my second MSAU but there are differences, mainly in looks, but there is a new safety in it and trigger guard. Also the barrel is shorter I think. Overall I think the looks are better and it still is most probably just as good as the MSAU.

-Removable magazine
-Doesn't use too many pieces
-Can have optional front grip
-Rather easy to use
-Trigger guard

-Handle might be uncomfortable for some people
-Can be hard to load at first (But becomes easier with some practice)

More Instructables by me.

Noteconcerning images : Image one shows the MSAU with optional additions. Image two shows the basic version.

Step 1: Main Body: Making the Components

Picture of Main Body: Making the Components

Make the following in the quantities given. For reference they have been assigned a letter:

Image 1: Make 1(Part A)
Image 2: Make 1(Part B)
Image 3: Make 3(Part C)
Image 4: Make 3(Part D)
Image 5: Make 2(Part E)
Image 6: Make 1(Part F)
Image 7: Make 1(Part G)
Image 8: Make 1(Part H)
Image 9: Make 2(Part I)
Image 10: Make 1(Part J)

Step 2: Main Body: Construction

Picture of Main Body: Construction

Follow the images using the components you've made in the previous step:

Image 1: Attach blue and white rods to part A and a small gear.
Image 2: Add part B and more blue rods, a yellow rod, and a blue spacer.
Image 3: Add parts C, D, E, white and yellow rods, red and orange connectors, and gray spacers.
Image 4: Add parts C, D, F, G, and red and orange connectors.
Image 5: Add parts C, D, E, red and orange connectors, and blue and gray spacers.
Image 6: Cover with part H.
Image 7: Add parts I and J, an orange connector, 2 gray spacers, and a small gear.
Image 8: Add gray connector.
Image 9: Add 2 blue spacers and metallic blue clips.
Image 10: Add 2 gray connectors.
Image 11: Add metallic blue clip.

Step 3: Magazine/Handle: Making the Components

Picture of Magazine/Handle: Making the Components

Make the following in the quantities given. For reference they have been assigned a letter:

Image 1: Make 2(Part A)
Image 2: Make 2(Part B)
Image 3: Make 1(Part C)
Image 4: Make 1(Part D)

Step 4: Magazine/Handle: Construction

Picture of Magazine/Handle: Construction

Follow the images:

Image 1: Add white rods to part A.
Image 2: Add parts B.
Image 3: Cover with part A.
Image 4: Loaded.

Step 5: Optional

Picture of Optional

If you want to make the front grip make this. This single image should be enough.

Step 6: Operation

Picture of Operation

To load remove the mag and place the pin in the appropriate area. Now place the ammo in the mag. Insert the mag into the ammo feed. Next push the white and blue rods in the ammo feed area out to the sides. Hook the rubber bands on the end of the barrel and the trigger spoke. Make sure the rubber bands are on both sides of the ammo. Once all the rubber bands are hooked push the blue and white rods back into the center. Remove the pin. Pull the trigger to fire (in case you didn't figure that out).

Image 1: Magazine with ammo.
Image 2: Rubber band hooked on barrel.
Image 3: Loaded, view of midsection.
Image 4: Safety engaged, magazine out.
Image 5: Safety engaged, magazine in.

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. Even with safety engaged it can fire. Always treated it as armed.


MrSillyGuns (author)2010-12-12

this is really cool

Masterdude (author)MrSillyGuns2010-12-13


~KGB~ (author)2010-12-11

thats pretty kool! =D

Masterdude (author)~KGB~2010-12-11


~KGB~ (author)Masterdude2010-12-11

no prob

SomeAsianKid (author)2011-04-11

You wasted 1 hour of my life...

Masterdude (author)SomeAsianKid2011-04-11

What? Did you try making a piece count or tried building but lacked the pieces?

SomeAsianKid (author)Masterdude2011-04-11

no i made it but it failed like the trigger

Masterdude (author)SomeAsianKid2011-04-12

Did the connectors at the trigger mech snap off?

Fred the evil puppet (author)2011-03-24

once you have fired the gun, the excess elastics get in the way of the next bullet, then those elastics get in the way etc. any way to stop this?

1. Use thinner rubberbands.
2. Use less rubberbands.

That is one thing which limits ammo capacity and efficiency in my guns so in some high ammo cap guns (MHMG) I made the ammo feed wider so more of them can fit.

Fred the evil puppet (author)2011-03-24

what is part j used for?

It keeps the barrel front lined up properly. It's used in image 7 I believe.

Fred the evil puppet (author)2011-03-24

is a stock possible?

Yes. You can make it like in the first MSAU but I didn't include it in this I'ble.

Fred the evil puppet (author)2011-01-15

This needs a more effective mechanism.
I made it and the wheel would not handle
The firing, and so the trigger wouldnt pull back
Enough, so the wheel would not spin.

It worked for me. Do the rubberbands cause it too hard for the trigger to be pulled back? In that case you might want to try weaker rubberbands.

No, just the fact that the connector used to allow the wheel to spin wouldn't move back far enough.

I also had some problems with that but the way to fix it is to have rubberbands pull on the spoke hard enough to move the connector back.

altair ibn la ahad (author)2010-12-10

i like it it is smaller than your firtst on which makes it easier to conceal but hopefully the mag isnt removable beacuse in your last one the handle kept falling off,
ps keep up the good work

I'm pretty sure it is smaller but the mag is removable (sorry if you don't like it), however if it bothers you so much I'm sure you'll be able to mod it. Also I am still at work and am working on a new MBSR (Masterdude Bullpup Sniper Rifle). It's still not finished, but I probably will finish it some day and post it.

sweet a new semi auto sinper

Any thing you'd like to be changed from the old to the new version?

yeah make it more compact like a pdr or p90 so it doesnt use all my pieces and i have enough to make it.

Well it's a sniper, and a strong one so I try to make it as large, and therefor powerful as possible. However the MBAR's are basically compact versions of it.

ah k

and u should post it for christmas

I'm not sure I could get it posted by then.

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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