Introduction: FN Five Seven (Build)

Picture of FN Five Seven (Build)

The K'NEX FN Five-Seven is a favored build by many K'NEX gun instrucable'ers. With 7 favorites and over 800 views, it is bound to be of good quality. This set of instructions will tell you how to build this "much liked" gun, but first, lets look at some stats.


• Smooth slide
• True trigger
• Shoots 30 -35 ft.
• Looks relatively accurate
• Does not need more than one broken piece
• It is to-scale

Let's start building!

Step 1: Lower Reciever

Picture of Lower Reciever

So, this is the step to build the lower receiver, by far the longest set of pictures in this particular instruction "handbook." To build, just follow the image notes, and you should be all set.

Step 2: The Upper Receiever

Picture of The Upper Receiever

The upper receiver should be a relatively easy step to do, just follow the pictures and their image notes.

Step 3: Trigger Guard and Firing Pin

Picture of Trigger Guard and Firing Pin

Just build what you see in the pics.

Step 4: Rubber-banding the FN Five-Seven

Picture of Rubber-banding the FN Five-Seven

Again, just follow the pics.

Step 5: Finished!

Picture of Finished!

Now that you are done with your K'NEX FN Five-Seven, get some one slot dark grey connectors, push them up the handle, get a magazine pusher (like one you see in the pics) that uses a rubber band to push it up, and pull back the slide until the FP catches on a bullet, allow the slide to go forwards, and then pull the trigger.


akshat21045 made it! (author)2014-03-02

Here you go then! Also, I removed the trigger guard (It was getting in the way) and it was a bit too heavy so I removed the front part too. You can see the firing pin that I used (I prefer this firing pin for guns, with the nub cut off, the bullet doesn't snitch on to it).

My overall experience with the gun would be an A grade, reason being the gun itself not getting enough range. My range would be around 25 feet which I did not expect from this gun. It was fun to cock and is more of an indoor gun which is why I like it. I would have given it a B+, if the feature of slide mechanism was not there.

If I would tell the people in the community, I would say that if they battle indoors, then voila! You got an excellent gun. But if you battle outdoors, I would recommend this as a secondary.

Again, the building experience was awesome, and it was totally worth it. When I used my i'ble, it took me exactly 12 minutes 34 seconds to build it! Super easy to build, super easy to fire.


Want a review Red?

I am so glad you like the gun, but to be honest, I doubt that anyone would use this for a primary or a secondary in ANY circumstance, and that is why I would really like to work on a pistol that is grip/handle fed, is not slide operated, but still looks and works great.

You don't have to write a review if you don't want, but if you do write one I would be very happy.

Nah, I'll just pass for the review. It is more of an aesthetic gun than a war gun. I would just toy around with it rather than using it. :P

I just gave an A because it is an awesome gun indeed. I would definitely recommend it as a gun if you are bored and want to have fun with.

The Knex Inventor (author)2016-06-05

I built this one a while ago, but I could not get it to work. The slide kept coming off. Great model though.

Doc Penguin (author)2015-03-22

it is truely a brilliant gun
but it uses too much broken pcs.

matthew9876 made it! (author)2015-03-17

it turned out good for me but the slide didn't work and the trigger guard was getting in the way so I took it off but it's still a good gun.

Dr MonkeyMan (author)2014-07-18

Is big enough to be a Desert Eagle.

Fred the evil puppet (author)2014-03-08

Hey Red, I recently subbed to you, and I love your creations! They look so awesome :D

One problem I've had with this gun, however, is that it is rather unreliable and the top reciever wants to fly off. Maybe you could work to fix this in your next gun? I really like the slide idea though; It makes it feel like a real gun.

I too had this problem, but then it didn't happen that often, so I just ignored it... maybe a rubberband may help with this case, but then cocking will be harder.


Hey Fred,

Thanks for the sub man, I am glad you appreciate my stuff! Well, if you want a better overall K'NEX pistol, you might want to try my new PMR-30. While I haven't shot it yet, I am pretty sure it will turn out better than my Five-Seven, even though it does not have a slide.

I have thought about returning to my Five-Seven before, but right now I have other things I'd like to build... XM8/M8/M8A1, AAC Honey Badger, I have a PMR-30 in progress... etc, etc.

pongopeter826 (author)2014-02-27

Having trouble with the mag it with I cock the gun back all the bullets fly out.

Huh, weird. If you could give me some pics I might be able to help you out.

nerfrocketeer (author)2014-02-24

Nice one, Red, and as for that tan rotation lock that you said needs to be broken, it can easily be replaced with a blue cap.

Wow, do I see an organisation box behind that? Did you use my i'ble?

Yeah, that is a box I made to house and organize my K'nex. I didn't use what you made, as I don't have as many pieces as you, and built this a year ago, but yours and mine are sort of similar. Remember on your ible when I said I had a slightly different method? This is it. I've been planning to post it sometime, but I haven't gotten around to it. :)

Oh okay! That is a great idea! Wait a minute, I thought you had more pieces than me! (Although you do have a lot more Nerf guns than me, partly because Elite guns are yet to be launched in India.)

Ha, no I only have like 2500 pieces or so. Yeah, but I have 90 Nerf blasters, though.

*spitting out cereal* YOU HAVE 90 NERF BLASTERS?!?!?! Woah. I have just 9 right now...

XD cereal? Haha, well I've been in the biz for a while now, so yeah, I have quite a collection, but when I say "Nerf," I mean Nerf, Buzzbee, and homemade guns, as well as blasters of various other origins. My pure Nerf collection is about 60. Also, having 9 guns is plenty to get the job done, often I find some of my guns covered in dust from intense disuse ;). It takes a lot to keep them all running.

Thanks man, and I believe I said something about that in the instructable... didn't I?

akshat21045 (author)2014-03-01

Hey Red, I made it! Want some pics?

Yes please!

hunter999 (author)2014-02-24

Nicely done Red. hmmmm wasn't this the one that TheRacker built and you told him to take the pics off or something...?

I am actually thinking about working on a V2, but I have not made up my mind yet. I am glad you like it. As to the little "tizzy" TheRacker had, just ignore him. He did not like the idea of me selling instructions on how to build this gun. In the end, it would have been to hard to sell this instruction set, so I just decided to post it.

Oh right, well that very nice of you to post an 'Ible on this amazing gun! Yeah I kinda know that there are some haters *cough*Zak*cough* but as long as most of the community likes the gun, you should feel satisfied that you have done a good job! :-)

XD: "*cough*Zak*cough*" True dat. Again, I'm glad that you like the gun!

Haha, yep I don't know if that was taking it a bit too far. And again, no problem :-)

dr. richtofen (author)hunter9992014-02-24

Yes, because Red wanted to sell an E-book including photos of this gun, and of a bunch of other k'nexers

hunter999 (author)dr. richtofen2014-02-25

Oh right, thanks for telling me...prehaps I shouldn't have posted that comment after re-reading it (I don't want to get in Red's or TheRacker's ways. :-/

No, no, you are fine, its all good.

Phew! ;-)

Actually, that was a different instance. I received permission from all of the K'NEXers featured in that booklet to use pictures of their guns. The example hunter999 is talking about was a "tizzy" TheRacker had on my FN Five-Seven slideshow page.

I know which tizzy he meant, the one that is currently deleted on the slideshow.

I mean that comment more as what happened too, I guess.

Zombiekiller-93 (author)2014-02-24

Nice Five Seven, unfortunately I going to have to move the Dragunov review back to April but for March I will be posting two (yes two) of my first ever full instructions.

Thanks man. Awe, that is too bad. Sounds good.

Glad you ok with that and I promise you now that the Dragunov review WILL be uploaded a few days after the start of April and I REALY mean it this time, no word of a lie.

Okay, cool!

dr. richtofen (author)2014-02-24

For how close you can get to a pistol shape with k'nex, this looks great.
The instructions aren't bad or so, like you said in the comment below :p

Yeah, thanks man. As to the instructable, is there anything wrong with it that you can see?

You're welcome. And I don't really see anything wrong or so. It's all clear

Okay, sweet!

akshat21045 (author)2014-02-24

Yay! I was gonna buy the e-book but then I saw this! Thanks for the i'ble Red!

PS- First view and 2nd comment (The first being yours)

hunter999 (author)akshat210452014-02-24

And I take first fav ;-)

Oh, you were? Wow, I did not think anyone would...

sandroknexmaster (author)2014-02-24

Looks good!

nerfrocketeer (author)2014-02-24

Never mind. I see you mentioned that... Thought you meant something else... ;) :P

O.K., cool. =D

nerfrocketeer (author)2014-02-24

The large blue connector.

About This Instructable




Bio: K'NEX gun builder here at Instructables. More or less retired from the community, but I still pop in now and again.
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