Introduction: TR8-2013 Last Updated 04/01/2014

Picture of TR8-2013 Last Updated 04/01/2014

04/01/2014 video TR8 overview and updates

08/31/2013 Step 7continued
08/29/2013 Step 8 Attachment Slide/Charging Handle
08/26/2013 Step 7 K'nex War 2013 inspired mods!!!

07/20/2013 DISCLAIMER! DO NOT AIM OR SHOOT THIS K'NEX GUN AT PEOPLE, ANIMALS, OR ANYTHING YOU DO NOT INTEND TO HIT. USE AT YOUR OWN RISK. This is my tested and K'nex WAR proven TR8-2013. If this gun which is built entirely out of K'nex is not built exactly as I have pictured IT WILL NOT PERFORM AS I CLAIM IT WILL. This gun was designed and built to shoot fin ammo. I will be showing both how to build the TR8-2013 and fin ammo. With both the gun and the ammo built exactly as pictured only then can I promise you similar results as I have obtained with this gun. As far as modding do as you wish but know that if your gun does not perform as good as I said it could consider that it is your mods that have tampered with the final results. I recommend that if you do attempt to build this gun you place each and every piece in place exactly as I have done so or please do not expect similar results. With all that political mumbo jumbo out of the way lets get to building!

the TR8 was designed and built around my fin ammo
over 4 years of development since first introduced in 2009
tested, retested, improved, and proved reliable and effective at 3 major K'nex WARS
auto rotating turret with ratchet for ease of use and rapid ROF
8 round turret capable of shooting any size rod including oodammo and fin ammo
capable of shooting fin ammo up to 300ft with 6 or 7 size #64 rubber bands

Step 1: Turret

Picture of Turret

16 Standard Metallic Blue Clip Connectors
3 Standard Tan Clip Connectors
40 Standard Light Gray Connectors
5 Standard White Connectors

2 Blue Spacers
2 Silver Spacers

32 Standard Green Rods-3/4in
8 Standard White Rods-1 5/16in
8 Standard Blue Rods-2 1/4in
1 Standard Black Rods-7 1/2in

1 size #64 rubber band

Step 2: "Block O K'nex" Barrel/Body/Grip/Trigger

Picture of "Block O K'nex" Barrel/Body/Grip/Trigger

9 Standard Black Rod/Connectors
4 Standard Metallic Blue Clip Connectors
2 Standard Tan Clip Connectors
2 Standard Dark Gray/Purple Connectors
3 Standard Orange Connectors
22 Standard Red Connectors
3 Standard Green Connectors
33 Standard Yellow Connectors
1 Standard Gold Connector
10 Standard White Connectors

1 Blue Spacer
1 Black Ball Socket
1 Black Hinge

30 Standard Green Rods-3/4in
2 Standard White Rods-1 5/16in
2 Standard Yellow Rods-3 7/16in
7 Standard Red Rods-5 1/8in
1 Standard Black Rod-7 1/2in

1 size #64 rubber band

Step 3: Pistol Grip/Stock

Picture of Pistol Grip/Stock

4 Standard Black Rod/Connectors
3 Standard Light Gray Connectors
8 Standard Orange Connectors
8 Standard Red Connectors
7 Standard Green Connectors
53 Standard Yellow Connectors
2 Standard Blue Connectors

6 Blue Spacers

48 Standard Green Rods-3/4in
37 Standard White Rods-1 5/16in
6 Standard Blue Rods-2 1/4in
4 Standard Black Rods-7 1/2in

6 Black Wheels-1in
6 Black Tires- 1 1/2in

Step 4: Firing Pin/Guide Rod

Picture of Firing Pin/Guide Rod

1 Standard Metallic Blue Clip Connector
1 Standard Dark Gray/Purple Connector
1 Standard Light Gray Connector

1 Black Ball Socket

2 Standard Black Rods-7 1/2in

1 size #64 rubber band
electrical tape

Step 5: Final Assembly

Picture of Final Assembly

1 Standard Light Gray Connector

2 Standard Green Rods-3/4in
2 Standard White Rods-1 5/16in

1 size #64 rubber band on the charging connector
1-7 size #64 rubber bands on the firing pin

Step 6: Ammo

Picture of Ammo

I designed the TR8 around my fin ammo which over the years has gotten better and better. Fin ammo is quite simply a Standard Gold/Red Rod-5 1/8in with scotch tape fins along with some electrical tape for added stability. Fin ammo is the reason for my TR8's superb range and accuracy. You can load up the TR8-2013 with any size K'nex rod or even oodammo and never achieve the ranges this gun is capable of hitting. With fin ammo and 6 to 7 size #64 rubber bands your TR8-2013 if built exactly as I have just shown you will obtain ranges of 300ft arched. Which should translate to over 100ft flat. Any target at 100ft is fair game and easy to hit with fin ammo and the TR8-2013.

TR8-2013 accurate/max ranges
any size K'nex rod will accurately shoot 25ft max and 75ft total
oodammo will accurately shoot 50ft and have a max range of 75-100ft before they begin to break at impact of the firing pin. I highly recommend using a max of 5 size #64 rubber bands on the TR8-2013 with oodammo. Any more than that and they break before they ever leave the gun.
fin ammo will accurately shoot 100-125ft and have a max range of 300ft. They shoot straight and what you aim at will be hit. The key is knowing how much to "lob" the shot at ranges above 100ft. Any projectile in the world follows the rules of gravity however it is a matter of knowing how to aim the shot. I've hit targets at 200ft away with the TR8 it just takes some practice.

Step 7: K'nex War 2013 Mods

Picture of K'nex War 2013 Mods

The turret mods is great for a few reasons. First the turret pin aka the black rod I replaced the silver spacer on the end nearest the gun body with a blue spacer and blue clip. The reasoning behind this is to keep everything together if the turret falls off or is removed for maintenance. No more lost silver spacers. As for the turret itself during the war my friend was having trouble with his trigger for a bit. The problem was that over time the connection of the y cons to the red connectors would wear causing them turn inward slightly jamming the trigger from being pulled. This would obviously be a problem. So I had to design a better trigger hence the new trigger. But before I had a chance to look at it he decided it was best to throw the gun to the ground turret first smashing the 6th layer snowflake connector into the 5th open layer. I originally left the 5th layer open for ease of disassemble not thinking someone would smash it in like that but now I realize I needed a sturdy 5th layer! lol The 5th layer consists of a white "snowflake" connecter with y cons on it to evenly space and support the turret as a whole. The prevent the tan clips from sliding off and also keeps the entire turret super super solid. Because I jammed green rods into the turret between the y cons as pictured it allows the tan clips to be used which saves on blue clips. Most people don't have millions of blue clips so it is a nice feature to have. Before without the green rods you couldn't use tan clips because it would offset the turret shooting the projectiles either right or left depending on how it was made I cannot recall which direction it angled the turret. So overall it is really really cool. To sum up the turret improvements... It is stronger, more supported, has a super solid 5th layer making 6 extremely solid layers, allows for tan clips to save on blue clips, and if the turret is ever removed... no more lost spacers! So that is pretty much the improvements and only problems from the war on my TR8. No broken pins or anything like that. Gun shot great again and now with these mods should be even better. I am going to test the mods out for a few weeks have my friends put them threw hell and see how it all turns out! I am very very excited the gun is working better than ever!

Step 8: Attachment Slide/Charging Handle

Picture of Attachment Slide/Charging Handle


nerfrocketeer (author)2013-07-19

I meant :)

eheise9616 (author)nerfrocketeer2017-08-20

hi is anyone here

i just wanted to say that my gun wont take the weight of even 4 elastic bands

do you know how to help

and with 3 its like impossible to pull back

ItzFormulaX3 (author)2017-08-05

I built the TR8 with all of the latest mods you have posted and I used #64 rubberbands and Holy cow is this gun the definition of pure awesomeness. I built the srv3, the DAM, and the TR18 but the TR8 is definitely the best out of them all so good job Knex Lego Maniac love your work keep it up man:)

DukDukboy101 (author)2017-05-04

Building this soon!

Check out my YouTube channel KILLERK or KnexLegoManiac for the latest updates! Also BlueMullet did a video review on his page that is the latest mods. Good to hear from you!

DJBoss8756 made it! (author)2016-01-28

WOAH! THIS IS TAKING AGES TO COMPLETE!! ? IM EXHAUSTED!! As a matter of fact... I'm a bit TIRED... (& the award 4 best pun goes to...)

EpicMinecrafter870 (author)2014-12-08

Are y clips necessary

sonic broom (author)2014-06-09

this gun rocks it is one of the best knex gun I have seen

thank you very much did you get a chance to build it just curious? Also I have a few more mods coming that I have to put up and take pictures of or make a video

Yes I made it but it hurt my fingers to make it but I Guess that's what you have do to make a good gun

Dashadower (author)2014-06-03

I have to admit, you really are a genious when it comes to knex building. Drum mags and shoots 300ft? If you mod this, this literally becomes a semi-auto revolver sniper rifle! 5*

thanks for the compliment really appreciate it um you get a chance definitely recommend you build again its a lot of fun the shoot and a great build

sonic broom (author)2014-06-07

do you need the gold knex piece for it to work

Which gold piece? They are useful probably replaceable tho they have a purpose

Thanks for the info

no problem man um just so you know that parts list is not up to date with the newest pictures I'm hoping to sooner than later post up more recent pictures there's some modifications to the trigger that made everything like that so the very least I plan on making a video and I'll try to get that to you as soon as possible

It says in the part list 1 standered gold piece

thecheater2000 (author)2014-04-09

Wow... Thanks, I'm going to build the gun but one more question, how long will it take? I'm not very experienced with building knex guns

thecheater2000 (author)2014-04-08

Not to be that guy... But how powerful is the gun? I'm thinking on building it but I don't want a cool but weak gun.

Well with 5 size #64 Rubberbands and my fin ammo it will shoot at least 250ft up to 300ft with a max of 7 bands. The gun will shoot threw drywall as well with 5 bands. So I'd say it's the most powerful K'nex gun that has such a quick ROF

beebee947 (author)2014-04-01

to be honest I thought this gun was going to suck but it's actually really good

Thank you I'm happy you like it! Just curious why initially you thought it would be a crappy gun? Lol

Fred the evil puppet (author)2014-03-09

If I were to replace the TR8 turret with a TR-18 turret, do you think it would still function to a similar standard as you intended it to?

with some mods maybe not saying it couldn't be done but the 8 is a great all around balance

TheFoofinator (author)2013-09-01

Dat Slide...

TheRacker (author)TheFoofinator2013-09-10

It's actually amazing.

TheFoofinator (author)TheRacker2013-09-12

So good!

The slide is extremely awesome! I don't use the gun without one now! It makes charging the gun so so much better


Mace! (author)2013-08-25

Did anyone take a video of the 2013 K'nex War?

Knex Lego Maniac (author)Mace!2013-08-25

got some up on my 2013 war forum

Mace! (author)Knex Lego Maniac2013-08-27

I don't see it, under forum topics?

Knex Lego Maniac (author)Mace!2013-08-27


pongopeter826 (author)2013-08-25

The new trigger fixed it thank you so much!

happy to hear it! Try out the new turret too!

pongopeter826 (author)2013-08-24

The tr8 fire pin keeps getting stuck on the first yellow connector after the trigger here is a picture

try a few of the new mods on step 7! They are inspired from the K'nex War 2013!!! I believe the new trigger will help you out on this one!

take a few more pictures of your gun and I will do my best to help you out. You may need a new black rod for a firing pin or it could have something to due with your trigger either way I would need to see a few more pics of the gun from a bunch of angles.

sandroknexmaster (author)2013-08-16

Congratulations for being selected as a finalist in the Toy Rods and Connectors Contest!

thank you very much! Thank you for your support :)

No problem ;D

Raz1r Knex Bull3t (author)2013-08-01

Lol, I'm thinking about building this and the Swagboss again. Thanks for posting this man. Love all your work. Oh and sorry for the late comment, I just didn't have an idea of what I should say at first. : P

Kinda late reply, but the Swagboss isn't that great. Uses tons of pieces for not that much power and mostly just a novelty trigger.

I actually happened to like the swagboss when I built it. Sorry to hear you had problems with it. At this point now, I'm just to lazy to build it again.

I didn't have problems. It worked just like it should. But overall it wasn't that impressive, just build a normal TR18.

Also I see my comments are showing up again.

Sounds great take some pics! Thanks for the comment!

Mace! (author)2013-08-05

Have you ever tried replaced the dark gray connector on the firing pin and guide with a black hinge piece? You can kind of see what I'm talking about in the picture hopefully. It reduces a lot of friction, making the pin a lot easier to pull back. If facing the right way, it adds to the distance the pin can be pulled back, giving the trigger more room to lock in. It hasn't seemed to decrease performance any, in fact it may even improve ranges by a few feet. I'm not completely sure how reliable it is yet though, so it might not hold up over time.

Knex Lego Maniac (author)Mace!2013-08-05

I do believe I remember trying this before however it was not as reliable and did not hold up as well under the pressure I usually put my gun under. With fewer bands it may preform decent but overall I would not recommend it. Do you have a picture of the entire gun? Oh by the way thank you for the suggestion I always appreciate ideas even if I've attempted them before or not. You never know till you try

Mace! (author)Knex Lego Maniac2013-08-06

Yeah after 80 times shooting it broke. It worked well for a while though. I do not have any more pictures at the moment but I did add the slide from the TR-18 to it.

Knex Lego Maniac (author)Mace!2013-08-06


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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