Introduction: TR8-2015 Updated 05/01/2015

Picture of TR8-2015 Updated 05/01/2015

Step 1: TURRET

Picture of TURRET





Step 4: STOCK

Picture of STOCK

Ignore the outdated outdated handle and trigger.


Video coming soon 05/01/2015



Step 7: AMMO

Picture of AMMO


See my YouTube channel to stay up to date on all the latest changes to the TR8.


dynamite_kid (author)2017-10-21

what does the turret do

PindaHoofd (author)2017-06-18

So I managed to get hold of some K'nex, built it, loved it.

The new trigger hasn't misfired once and the new firing ping with the o-ring on it seems to be the best way to secure the firing ping.

I like how you have been developing this gun over the years, and it really shows.

I truly believe this is the most consistent gun you can build out of K'nex.

So good to hear! :) I have even more recent updates on my Youtube account KnexLegoManiac. It has an even better trigger and other mods including better firing pin etc... so if you want in my opinion a much much improved version look my Youtube! :) It has been some time since I've worked on it or anything Knex but every now and then I love building or shooting them:) Keep in touch I appreciate the tremendous compliment!

Hey, no problem man! I meant everything I said.

As for the mods, I had already seen them and already had them applied to my gun haha.

Anyway, I ended up removing the barrel and ended up making a NAR out of it. I have no idea how I managed to built it 7 years ago when I was 13 but holy fuck did it remind me of the antagonizing pain you feel in you fingers when you snap the 8th rod into a row of white connectors. Not fun.

Also, do you have any gun on your mind which you would really want to recommend me? (Keep in mind I don't have a shitload of pieces like you.)

PindaHoofd made it! (author)PindaHoofd2017-06-28

Here is a picture of the NAR.


- New trigger

- Modded stock and handle (Original one is a little bit too small flimsy for my taste.)

- Slide on the rails (Love this one)

The NAR looks great! I love seeing pics/vids of builds. I have no idea what to recommend. One of the most complete and fun builds I've made is my DAM K'nex Mine! It is a simple build yet very very powerful and affective! It was a difficult build to develope and balance such light trip but I think it is awesome! It is a great prank build! My other recommendation is my SRv3 but I would need to get you pics and videos. It is amazing to shoot K'nex over 500ft!

So I decided to count the amount of yellow connectors I have, and it turns out I have 140 of 'em. Assuming most of the body uses yellow connectors, will I be able to build the SRv3?

I do not believe so. It requires a few hundred I believe

The Knex Inventor made it! (author)2016-06-04

Here's mine. My only problems with it were that the trigger only blocked half of the firing pin, and thus caused occasional misfires. Also, after the slide had been pulled back, it had to be carefully guided back to the front of the gun, or else the gun would have misfired.

I just saw you are using the old trigger design lol which did have some trouble use my latest design for more consistent charging see my YouTube videos for more assistance

Actually, I used the one on this page, which is the new one. The problem with it is that it would only block half of the barrel, which caused ocasional misfires.

The point is that the one on this page is outdated and the one on his Youtube channel is newer. Also like he stated, using a strong rubber band will ensure that the trigger sets properly every time you pull the firing pin and that it does not misfire.

use a size 64 rubber band on the trigger this will set the trigger properly each time you charge the gun preventing any problems see my YouTube channel for further assistance

Thanks for the advice! I will do that the next time that I build this.

My YouTube channel has the only pictures/video of the most recent trigger btw. Just went through this ible and it is outdated. I have not built much as of lately but eventually i will update the gun ible and perhaps post the SRv3.

Good idea. I will definatly build the SRv3 if you post it.

PindaHoofd (author)2016-05-26

Rofl it's been like 7 years since I've been here and I can't believe you are still active in this community, or semi-active I guess.

Just looking at these posts gives me the feels man :'(

I just want to build this thing again but my mom gave all of my knex away because I stopped playing with it...

Anyway, cya around 'KillerKyle' ;)

lol good to hear from you hope to cya around more often

CorgiCritter made it! (author)2015-09-11

I built it! You are so right about the new trigger on YT, it works so much better! There is way less friction, the gun charges better, and the trigger pull is light enough. The slide action with the new trigger is SO SMOOTH! You were not lying about it seeming effortless. I was getting 70 feet with only 3 old #64's and yellow rods, and oodammo really stings on bare skin with those bands too.

The handle is also much sturdier then on the 2014 version, much much better. I ran around my yard shooting a trees with this gun, charging and shooting while running. The gun feels great and charges fine even when running around.The people who say the TR8 is not that good need to build with the new trigger, 'cause this is the smoothest working K'nex gun I have ever built, and I have built at least 60 different designs. Not to mention this is very accurate, with oodammo I could hit someone consistently at 50 feet.

PS: The silver spacers on the red rods that keep the trigger block straight, should be taken off. I found that they add extra friction to the trigger block, so it won't move up far enough to block the firing pin sometimes. This sometimes caused the gun to misfire. Other then that I have had no problems whatsoever.

I love this gun! I can get you some pictures later, if you want them. :)

Happy to hear you like the changes. One of these days i should update the instructions to get reflect the most current design. Do you use a size 64 rubber band on your trigger? If not the trigger may not set as consistently. It would be interesting to see pictures or a video! Again happy to see you like it!


I did use a #64, if I remember, the issue only happened a couple times.

Well, it's gone now, but I may rebuild it sometime. It really was an improvment over the old version.

Knex Lego Maniac (author)2015-09-08

trigger design in testing to see if I can reduce wear to the trigger pin and less friction charging the gun.

I have seen the new trigger. I am planning on building today. TR with new trigger, in metallics, and with a slide. :D

TheRacker (author)2015-05-22

Geez how many different trigger combinations can you come up with for that tiny space? There have been what, 5? trigger designs now?

Hundreds and hundreds this trigger is yet to fail

Haven't you said that about the last one or two as well? I still have the version before this and it has never given me issue before.

I am much more confident with this trigger design over any other

Ynohtna102 (author)2015-07-13

The only end cap I can find is for micro rods. Where did you get yours?

Ynohtna102 (author)2015-07-13

Which size are the rubber tires? Where can I find the cap on the end of the turret on the knex site?

Ynohtna102 (author)2015-07-12

Which of the new pins turned out to be the best? Also, do you happen to know what the cap on the end of the turret is actually called?

The pin I use and is far superior in every way and is yet to fail or show signs of wear is the traditional "Indestructapin" with the o ring. There are 2 different size tires used on the grip. See K' parts and extras/wheels to see exact specifications

Ynohtna102 (author)2015-07-12

Btw, what size are the tires you are using on the grip?

Ynohtna102 (author)2015-07-12

Btw, what size are the tires you are using on the grip?

Lucas The Boss (author)2015-06-21

Hey killer, nice mods. Could you by any chance make a vid on how to make finammo? I've made it before but I have a feeling I'm not doing it right because they never fly perfectly straight but still fly a god 150 feet out of me and blue mullets LTBBM Weapon of war. I want to know how to make it correctly so I can make mags for it to hold finammo.

I know I'm not KK, but my experiences with fin ammo have been mixed. When I first built the TR, I thought it was pretty bad, and I don't think I got much over 100 feet. I built it again, and worked with the fin ammo some more and got better. The last time I built it I got a very good range of 280 feet. Not very shabby. Bad fin ammo will get poor range. It took at least a hundred tries to get fin ammo working great.

Also, you need to use red rods for fin ammo. I've tried yellow fin ammo in a TR and it doesn't shoot stright.

I too, desperately want KK to make a video for fin ammo, since I still struggle with it.

And yes, the pin on a TR8 can hold 7 bands with no fear of it breaking. The pin guide is well designed and that helps so much.

sonic broom (author)2015-05-20

I built it and it works great!

RandomCommenter (author)2015-05-08

I finished the gun super great.

I still have some pieces so I want to make something else.

I kept one of my 8 shot turrets and would like to make an 8 shot pistol that shoots 100+ feet. Do u have any recommendations?

Also cutting an end clip is really easy with the saw on the swiss army knife.

RandomCommenter (author)2015-04-22

Thanks for all the info I think I'm going to make a ball socket by cutting a normal single end clip at the end

ok sounds good

Do I need black rods or do grey ones work

myOmy (author)2015-04-16

Just finished building mine last night. I ran out of time to make the pin however. I made a makeshift one and I love this thing. Stock is too short for my liking, so I'll change that up. Everything else is on point. It is a very fun gun. I absolutely love the ratcheting turret. Pictures either later today or tomorrow.

Knex Lego Maniac (author)myOmy2015-04-22

see step 8 for a new firing pin design and a trigger update

myOmy (author)Knex Lego Maniac2015-04-22

alright,cool, sorry about no pics, I got busy with schoolwork

Knex Lego Maniac (author)myOmy2015-04-16

I'm excited to see your pics and vid!

Knex Lego Maniac (author)myOmy2015-04-16

I'm glad to hear you like it! The stock is short and simple I can agree with you on that. Good for close quarters and maneuverability tho.

RandomCommenter (author)2015-04-20

Do u have to have the ball socket or can I replace it with an orange connector?

the gun currently uses 2 ball sockets... 1 on the trigger which if i rearrange the trigger band will allow for use of a 1 slot purple/gray connector... and the ball sock on the firing pin is highly recommended but probably replaceable with an orange connector on the firing pin

So I don't need a ball socket?

you need one on the firing pin see step 8 for updates

use a gray or purple one slot connector on the trigger pin instead of the black ball socket

About This Instructable




More by Knex Lego Maniac:TR8-2015 updated 05/01/2015DAM updated 04/12/2015K'nex Directional Mine Prototype last updated 09/10/2013
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