Introduction: Knetix R-SAR K'nex Assault Rifle

Picture of Knetix R-SAR K'nex Assault Rifle

  Video is not working right now(at least for me).  Just right-click and hit "watch on YouTube"

The R-SAR (rail-system assault rifle) introduces a new type of firing system: the knetix rail system. This system is rubber-band efficient because there is less friction between the bullet and the barrel, because the bullet does not come into contact with the other ammo and most of the barrel until it is fired. Unlike other guns, this one uses more of a bolt system than a ram system, meaning there is nothing sticking out when you load it. It is very fun to just play around it.

Updates include a safety, more efficient barrel, and a more efficient trigger system

-contained firing pin
-good power (50-60ft with the rubber bands i used; you can use more)
-very original
-sounds SICK when you pull back the bolt
-8 round mag
-very accurate

-bolt will snap if too much pressure is put on it
-uses 3 broken pieces



Step 1: Outer Frames, Supports, and Trigger *updated*

Picture of Outer Frames, Supports, and Trigger *updated*

This step explains how to make the outer frames, the supports, and the trigger.

1. The two outer frames-make these
2. Make these
3. Connect with blue rods to form the stock/handle support (blue rods on handle do not have to be cut but it makes the handle much more comfortable
4. Support-any kind of spacer will work for the middle
5. Make these
6. Connect to form butt
7. Get these
8. Cut rods :(
9. Connect to make trigger
10. Attach supports to one frame, hold onto the other frame
11. Safety
12. Secure tan clip (pic taken after gun was finished)

Step 2: Inner Frames and Magazine

Picture of Inner Frames and Magazine

The inner frames of the gun with the magazine walls

1. Inner mag plates-make these
2. magazine walls and ammo guides-build these
3. Attach pieces like this
4. Attach second plate

Step 3: The Rail

Picture of The Rail

This is by far the most painful part of the gun to make. I had a lot of new calyces on my fingers when i was finished.

1. The rail
2. Make these pieces
3. Connect first two plates
4. Get these pieces but do no connect them i have just put them in the order they go in
5. Attach pieces
6. Attach third plate
7. Attach final plate (this one is very hard-i had to take it apart to do it)

Step 4: The Barrel *updated*

Picture of The Barrel *updated*

Pretty much a normal barrel

1. The barrel
2. Build this
3. Actual barrel-make this
4. Connect the two
5. Fake barrel parts-make these
6. Put them here
7. Second barrel plate
8. Attach

Step 5: Put Them Together *updated*

Picture of Put Them Together *updated*

Shows how all the parts fit together

1. Attach magazine to the outer plate
2. Improved placement (read image notes)
3. Front view
4. Broken piece :(
5. New trigger system
6. Different view
7. Attach like this
8. Attach outer plates
9. Attach rail
10. Attach barrel

Step 6: Firing Bolt, Trigger Connection, Stabilizer Pin, and Rubber Bands *updated*

Picture of Firing Bolt, Trigger Connection, Stabilizer Pin, and Rubber Bands *updated*

The firing bolt is the piece that launches the bullet, the trigger connection connects the rod block to the trigger, and the stabilizer pin keeps the bullets in place within the magazine.

1. Firing pin-make this
2. Put firing pin in so that the rail is between the two orange connectors
3. Secure on each side with 2-way connectors
4. Put 4 blue spacers on each side
5. Attach gray connectors and desired # of rubber bands on each side
6. Cut a red/metallic green rod a little shorter than a yellow rod with an orange connector (you do not need to make the yellow rod with orange connector)
7. Make stabilizer pin with the cut piece
8. Tie 2 rubber bands together like this
9. Loop through connector
10. Put stabilizer pin here
11. Make trigger connection
12. Connect trigger connection to rod block
13. Connect trigger connection to trigger
14. View of both
15. Put bolt rubber bands here
16. Mag ram-you could make it better i ran out of pieces
17. Put rubber band here
18. And here

Step 7: Loading and Firing

Picture of Loading and Firing

To load:
1. Remove mag ram + get bullet
2. Put desired amount of ammo in mag (up to 8)
3. Put mag ram back in
4. Pull back bolt

*Be sure to pull the trigger all the way through and also be sure to make sure the stabilizer pin is straight before loading.

Step 8: You Are Done!

Picture of You Are Done!

Enjoy the firepower , accuracy and overall awesomeness of the R-SAR



wieby909 (author)2014-08-31

Is there a piece count?

knexsim (author)2011-10-15

plzzzz can i probably buy on of these out of kex i rly rly wont this gun but i only have a box of 5000 knex parts and i used them up makeing my knex arsinal and this would be perfect for my set but i dont wont to brake them up ill pay anny thing lol

headlessknight (author)2011-07-21

is it possible to short this to like a pistol?

Kinetic (author)headlessknight2011-07-21

Unfortunately no because its length allows the rod to accelerate and shortening it would result in dramatic loss of power.

Football viking boy (author)2011-05-13

the pictures and steps are out of order fyi

knexsuperbuilderfreak (author)2010-12-18

i fixxed it YAY!!!!!!

aleceatsfood (author)2010-12-15

complex looking but very nice handle meh... but 4.5*

kevinvos (author)2010-12-13

i've made it, it was very difficult but i got it, AWESOME man only when you load it he gets stuck between the two orange peaces ;D

2331995 (author)2010-12-08

BLAH! Can you help out with this? :l Cause the updated one ive noticed is different because of the trigger mechanism and stuffles. Im having a hard time figuring out the trigger, the 2 grey rods at the bottom of the gun and the barrel >__<"

Kinetic (author)23319952010-12-11

Wait, you don't understand the pics, or it isnt working?

An Villain (author)2010-12-10

Why isn't this featured? Multiple times. 5*.

Dirtyboyy (author)2010-10-13

cool ! 5* and fav.

Kinetic (author)Dirtyboyy2010-10-13

Thanks man I appreciate it!

Sharir1701 (author)2010-09-27

dude i built the gun and the rods just go out of the sides of the magazine, and when i take the ram all the way back, the bullet doesn't load, beacuse its stuck behind the ram even when it's loaded all the way....... PLEASE HELP !!!!!!!!!!

mulletman6 (author)2010-08-10

mine doesn't work properly :(. The "bullet" pops out from under the cut red rod :/

nilsjah123 (author)2010-06-26

where do you buy knex?

geren11 (author)nilsjah1232010-07-22 There if you need any K'nex here's 26000 peices if you have $900 in spare change

kellykell (author)nilsjah1232010-06-28

try hoby city or

topcat123 (author)2010-07-06

If this gun shrunk in the middle do you think you could fire smaller rods

SonicX 22 (author)2010-04-11

 the instructions are wayyyy difficult to follow.


Kinetic (author)SonicX 222010-04-12

 Well no one else had a problem.

mettaurlover (author)2009-09-20

is the ammo SUPPOSED to not even get out of the barrel, or did I do something wrong?


KnexFreek (author)mettaurlover2009-09-21

my parents said i could have my knex back tommarrow and i could not get my own gmail

Kinetic (author)KnexFreek2009-09-21

Took away your k'nex? Thats harsh.

KnexFreek (author)Kinetic2009-09-21

i know :(

182515 (author)KnexFreek2010-02-06

Wyd they take it away?

KnexFreek (author)1825152010-02-06

to tell the truth, i actually cant remember!! That was awhile back and i forgit why!! It was probably something to do with school....


182515 (author)KnexFreek2010-02-07

oops i didn't look at the date on it : )

KnexFreek (author)1825152010-02-07

 no problem!!!

mettaurlover (author)KnexFreek2010-02-07

If it involved school, just become a threat to the stability of your house so they won't take it away. That's what I did. Enough types and sizes of tools to take apart a 747, minus the blow torch.

KnexFreek (author)mettaurlover2010-02-07


mettaurlover (author)KnexFreek2010-02-07

Yeah. I could dismantle anything in my house. Easily.

KnexFreek (author)mettaurlover2010-02-07


mettaurlover (author)KnexFreek2010-02-07

Yeah... Bad idea for anyone to piss em off; I have about a hundred pounds of wrenches and more pointy tools lying around in my room. I count the D-TAB as a tool.

KnexFreek (author)mettaurlover2010-02-07


mettaurlover (author)KnexFreek2010-02-07

What? I use it as a shotgun seeing as I don't have the pieces to make the turrets on hand.

mettaurlover (author)KnexFreek2009-09-21

why can't you get your own gmail? ill set up an accy for you on gmail, just give me the username you want and ill make it for you. also gonna need your name for accounting purposes.

KnexFreek (author)mettaurlover2009-09-21

coulds u do that for me????? thankyou sooooooooooooooo much idk u can make a username just use the word kevin and tennis thankyou sooooooo much ps respond to this in the morning cause i have to go to bed my parents are strict tonight srry... And thanks again . kevin

mettaurlover (author)KnexFreek2009-09-21

i messaged you with the link to make an account for it; just use that.

KnexFreek (author)mettaurlover2009-09-22

ok ill make one but my parents will wonder why they arent getting barrrages of instructables emails

mettaurlover (author)KnexFreek2009-09-22

just transfer your *current* account to the gmail account, then make a second account using your parents address. or, if that doesn't work(the making a second accy with the address) tell them that you made a free account on gmail so that their inbox wouldn't be cluttered anymore. they'll actually <em>thank</em> you for making one if you normally get a ton of ibles mail.<br/>

KnexFreek (author)mettaurlover2009-09-22

begged my parents all day and they finally said yes!!!!!!!!!!!!!!!! ill make one tonight and ill email you the new email adress

mettaurlover (author)KnexFreek2009-10-04

you made it yet? i dont have anyone new in my contacts or a message saying you did...

KnexFreek (author)mettaurlover2009-10-04

No cause when my dad came home he dissagreed with my mom, then he yelled at me, and told me I could only use my moms :(

mettaurlover (author)KnexFreek2009-10-04

trust me:if your dad thinks you're not mature enough to get your own email, side with your mom. anyway, females will always win in fights against males; they don't have the equipment we do downstairs to kick...

DJ Radio (author)mettaurlover2009-11-02

The only time dads win is when your mom is actually supporting what you do.

lioneatr (author)DJ Radio2009-12-21

 true dat

mettaurlover (author)DJ Radio2009-11-12


mettaurlover (author)KnexFreek2009-09-22

you don't have to send me amil; if you use the link i PM'd you, you'll be automatically added into my contacts and ill be added to yours.

About This Instructable




Bio: Sometimes it takes a man to push beyond what he thinks is possible before he realizes that possibility is a mere conception of the mind ... More »
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