Introduction: MBSR-2

Picture of MBSR-2

This is the second version of my MBSR (Masterdude Bullpup Sniper Rifle). It's been updated with new features such as:
-New compact magazine
-New sight
-Cheek rest
-In-stock compartment

-Removable mag
-Adjustable sight
-True trigger with trigger guard
-Good comfort
-Listed above in the new things

-Lots of pieces
-Can be hard/slow to load

More Instructables by Masterdude

Step 1: Barrel Part 1

Picture of Barrel Part 1

Follow the images:

Image 1: Make 2.
Image 2: Make 3.
Image 3: Make 1.
Image 4: Add blue rods as shown.
Image 5: Place 3 of the other parts as shown.
Image 6: Cover with the other part.
Image 7: Place the last part as shown.
Image 8: On the other side, add a metallic blue clip.

Step 2: Barrel Part 2

Picture of Barrel Part 2

Make the following:

Image 1: Make 9. (Part A)
Image 2: Make 9. (Part B)
Image 3: Make 9. (Part C)

Follow the images:

Image 4: Add four red rods to Part A.
Image 5: Add Parts B and C as shown.
Image 6: Add Part A and repeat this step and the earlier step while switching the sides of the Parts B and C until you get this.
Image 7: Add a red rod.
Image 8: Add a white rod as shown (for the bi-pod).

Step 3: Main Body: Components

Picture of Main Body: Components

Make the following in the quantities given. The parts will be assigned a letter for reference further on:

Image 1: Make 1.(Part A)
Image 2: Make 1.(Part B)
Image 3: Make 2.(Part C)
Image 4: Make 3.(Part D)
Image 5: Make 3.(Part E)
Image 6: Make 2.(Part F)
Image 7: Make 4.(Part G)
Image 8: Make 3.(Part H)
Image 9: Make 1.(Part I)
Image 10: Make 2.(Part J)
Image 11: Make 1.(Part K)
Image 12: Make 4.(Part L)
Image 13: Make 1.(Part M)

Step 4: Main Body: Construction

Picture of Main Body: Construction

Follow the images:

Image 1: Add blue and white rods to Part A, a green connector and small gear.
Image 2: Add Part B, blue and yellow rods, and blue spacers.
Image 3: Add Parts C, D, E, F, G, H, L, and green, red, gray connectors, and yellow, blue, and white rods.
Image 4: Add Parts D, E, G, H, I, K, L, and green, red, gray connectors, and blue spacers.
Image 5: Add Parts C, D, E, F, G, H, L, and green, red, and gray connectors.
Image 6: Add Parts G and L, and blue spacers.
Image 7: Add Part M and a tan clip.
Image 8: Add Parts J and a small gear.
Image 9: Add a gray connector.
Image 10: On the other side, add 2 orange connectors, 2 blue spacers, and a metallic blue clip.
Image 11: Add a gray connector.
Image 12: Add 2 gray connectors.

Step 5: Magazine

Picture of Magazine

Follow the images:

Image 1: Make 2.
Image 2: Make 2.
Image 3: Add white rods.
Image 4: Add the 2 other parts as shown.
Image 5: Cover with the last part.
Image 6: Make this.
Image 7: And also this.
Image 8: Put them together like this.
Image 9: Make this, this is the pin to hold the ammo back before loading.
Image 10: Loaded and ready to by put in the gun.

Step 6: Sight

Picture of Sight

Follow the images:

Image 1: Make one.(Part A)
Image 1: Make one.(Part B)
Image 1: Make three.(Part C)
Image 1: Make one.(Part D)
Image 5: Make these.
Image 6: Attach them to Part A , and add blue rods.
Image 7: Add Part C, light gray connectors, and a silver spacer.
Image 8: Add Parts C, D, tan clip, and blue spacers.
Image 9: Add Part C, light gray connectors, and a silver spacer.
Image 10: Add Part B.
Image 11: On other side, add tan clip.
Image 12: Add small gear.

Step 7: Bi-Pod

Picture of Bi-Pod

Follow the images:

Images 1-2: Make 2 of each.
Image 3: Put them together to get these.
Image 4: Add 4 white rods to a white connector.
Image 5: Add a gray and 2 green connectors and a hinge with a "Y" clip.
Image 6: Cover with a white connector and add 2 blue rods as shown.
Image 7: Attach red connectors as shown on both sides of the thing.
Image 8: Attach the earlier made legs as shown.

Step 8: Assembly

Picture of Assembly

Step 9: Use

Picture of Use

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 white and blue rods back into the center. Remove the pin. Pull the trigger to fire (in case you didn't figure that out).

Note: This gun loads and shoots like my other semi-automatic guns.

Image 1: Ammo.
Image 2: Magazine with ammo.
Image 3: Rubber band hooked on barrel.
Image 4: View of ammo feed when loaded.
Image 5: View of spoke in back when loaded. Safety Engaged
Image 6: View of spoke in back when loaded. Safety Disengaged
Image 8: View through the scope.(Sorry but it's sideways, Didn't mean to have it that way)

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


An Villain (author)2011-09-04

Not Bad. I like it. I'd rate but for some reason the stars are gone.

Masterdude (author)An Villain2011-09-04


~KGB~ (author)2011-01-19

looks quite nice, 4.5*

Masterdude (author)~KGB~2011-01-19


~KGB~ (author)Masterdude2011-01-20

no prob

Fred the evil puppet (author)2012-09-26

this gun looks and is fecking awesome.

Thank you.

An Villain (author)2011-09-05

I'd reply but for some reason the reply button is gone.

Masterdude (author)An Villain2011-09-06

I hate it when it does that.

An Villain (author)Masterdude2011-09-07

I'd hate it but for some reason the hate button is gone.

Masterdude (author)An Villain2011-09-08

I know, just when you want to hate something, the hate button is gone. Where's my hate button?
; )

An Villain (author)Masterdude2011-09-08

I'd reply with a smiley but the smiley button is gone.

Masterdude (author)An Villain2011-09-10

There never was a smiley button on I'bles was there? However I can reply with a stream of unusual symbols.


I guess I don't really have anything better to do. Well, maybe I should get to work on my I'ble. I procrastinate too much.

(On my MHG-1 I procrastinated for a couple months)

An Villain (author)Masterdude2011-09-10


james4 (author)2011-05-23

hmm this is called pusuedo semi auto if im correct

Masterdude (author)james42011-05-23

Many people call this a "pseudo semi-automatic" however there is/was quite a debate whether guns like this are truely semi-automatic or pseudo semi-automatic. I don't think a unanimous decision has been reach and whether this is a semi-automatic or pseudo semi-automatic depends on who you ask.

james4 (author)Masterdude2011-05-26

yeah like if 0 is an even number or odd number

Masterdude (author)james42011-05-26

Well actually, zero is odd according to sources like WolframAlpha and Wikipedia, but I understand what you mean. The term Semi-auto in the K'nex community has different definitions depending on who you ask.

james4 (author)Masterdude2011-05-28

yeah i think its even because there's no other thing thats odd that you cant pair up with

joey99 (author)james42011-08-16

0 is neather even or odd, it represents nothing

Fred the evil puppet (author)2011-04-26

Rightyo. I am building this, but! How far does it shoot?

Well, I'm not really sure since I can't test it right now since I don't have it built.

Depends on your elastic. It probably gets about 50 ft normally. Probably more if you have good elastic.

Fred the evil puppet (author)2011-04-26

Can you use your MHMG AP rounds?

jmand (author)2011-04-23

what does it fire and i have a sugestion when doing the steps dont put like"image1:make 2"in the comment of thestep put it as a kimage note in the yellow box on the pic its makes it easier to readinstead of counting the pics to find where youre at

Masterdude (author)jmand2011-04-23

The image should answer you question, and actually that's a good idea, maybe I'll implement it in my next I'bles. Thanks for the suggestion.

Vincent101199 (author)2011-04-09

how many peices dose it tAKE?

Masterdude (author)Vincent1011992011-04-09

I don't know but it is probably a whole lot.

Vynash (author)2011-01-19


These are all cool and all but... You should try a new style?

Masterdude (author)Vynash2011-01-19

Many people tell me that but I have yet to find a new building style in which I am really good at. Any suggestions?

razzlekunai (author)Masterdude2011-01-22

Not building every gun with pretty much the same mech?

Masterdude (author)razzlekunai2011-01-23

The mech does change over time. I would use another mech but I have yet to find one which is as good as the one I currently am using (semi-auto, reliable, and powerful).

razzlekunai (author)Masterdude2011-01-30

Well, what I meant by using the same mech was that every single one of your guns uses a pseudo-semi auto mechanism.
Maybe try building something that doesn't use a semi-auto mech, such as a gun that uses a firing pin?

Masterdude (author)razzlekunai2011-01-30

Currently I am doing an experiment with a firing pin mechanism gun. However it may be very probably that it will not come for a long time if at all. Meanwhile I post one or more guns using my standard mech.

TheFoofinator (author)2011-01-19

I quite like this gun! It could do with neatening up, but it looks powerful, is it?,

Masterdude (author)TheFoofinator2011-01-19

It is powerful. And by "neatening up" you mean?

TheFoofinator (author)Masterdude2011-01-20

Trigger mech on the inside, and closing the mag.

Masterdude (author)TheFoofinator2011-01-20

The mag is open so it can be more compact, otherwise it would be larger and would hold less ammo. Also if the whole spoke on the trigger mech was on the inside it would be a lot harder to load.

TheFoofinator (author)Masterdude2011-01-21

I see about the mag, but you can make the trigger go around the mag in these bullpup designs: Dj's Halo Battle Rifle

Masterdude (author)2011-01-19


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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