Introduction: K'nex F.O.S.C.R

Picture of K'nex F.O.S.C.R

Hi this is my first actual gun.
the name stands for:

this is a very good good and I had fun building it and hope you do too.
True trigger.
Ramrod NEVER comes out of barrel.
Accurate. (With yellow rods)
Good range. (with my rubber bands I got about 40-45ft)

No magazine.
Stock is too big.

Enough! Lets start building

Step 1: Stock

Picture of Stock

The other side is ecsacly the same. Also remember the blue rods.

Step 2: Firing Pin Holder.

Picture of Firing Pin Holder.

This section ataces the stock to the main body. It also houses the firing pin. Be carefal because I show both sides of the housing. Ask for help if you need it.


Step 3: Handle

Picture of Handle

Pritty easy but only add rods where shown. Do NOT add them if the are not shown.

Step 4: Barrel

Picture of Barrel

You shouldn't need help.
those blue connectors can be replaced by the tan connectors.

Step 5: Main Body

Picture of Main Body

Be sure to read the image notes.

Picture 2-3: yes that is a broken yellow rod. I diddnt break this on purpose it was already broken from a previuos gun. If you dont want to break your connector you can use a orange connector.

Step 6: Trigger

Picture of Trigger

This is simple. It is the trigger and trigger holder

Step 7: Foregrip

Picture of Foregrip

pritty simple. add a elastic band at the bottom.

Step 8: Firing Pin

Picture of Firing Pin


Step 9: Stock to Holdor

Picture of Stock to Holdor

Give a general description of the Stepthe connection points

Step 10: Barrel to Main Body

Picture of Barrel to Main Body

Simple but remember I show both side and make sure you have the barrel the right way round.

Read the image notes.

Step 11: Trigger & Foregrip

Picture of Trigger & Foregrip

Please read the image notes.
Sorry for the blury picture.

Step 12: Trigger and Overall Connection

Picture of Trigger and Overall Connection

you shouldnt really have any problems..

Step 13: Adding the Ramrod

Picture of Adding the Ramrod

Step 14: Sights and What-not

Picture of Sights and What-not

You should know where to put the bands. I use 3 bands to get about 40ft.


mford lee (author)2011-04-14

awsome gun 4.9*

Tom Buckey (author)mford lee2011-04-19


Knexman15 (author)2011-04-15

making it now looks good

slimshaddy (author)2011-03-20

4.5* and this gun was posted on my birthday

Tom Buckey (author)slimshaddy2011-04-07

Thanks! And happy Birthday for then!

slimshaddy (author)Tom Buckey2011-04-07


TigerNod (author)2010-01-23

Weird, I thought I subbed to you a long time ago. Anyways, good job, 3.5 stars.

Tom Buckey (author)TigerNod2010-01-24


TigerNod (author)2010-01-23

"Picture 2-3: yes that is a broken yellow rod."

Correction: that is a yellow connenctor.

Seleziona (author)2009-12-26

I can't imagine this being strong at all. :(

DJ Radio (author)2009-10-03

It looks weak. Try to use a black rod as a ram and make a longer barrel. 2 connectors between trigger and bullet lock does not make for a powerful gun. There have been single shots that shoot around 70 feet and require no modded parts.

Tom Buckey (author)DJ Radio2009-10-03

Well the modded part does not make any difference to the range. Thanks for the advice I'll be sure to do that in my next gun.

DJ Radio (author)Tom Buckey2009-10-03

Where did I say anything about modded parts? The short traveling distance of the firing pin makes the gun weaker.

Tom Buckey (author)DJ Radio2009-10-04

"There have been single shots that shoot around 70 feet and require no modded parts." There is where you said about the modded parts. Ill be sure to make the ramrod a black rod too.

DJ Radio (author)Tom Buckey2009-10-04

Yeah, but that wasn't related to my first statement, the reason your gun is weak isn't because of modded parts, it's because of the short traveling distance of your ram. Oh and make the barrel longer, more connectors between the trigger and bullet lock mean more acceleration speed.

Tom Buckey (author)DJ Radio2009-10-04

Okay, thanks for the advice! I'm worling on a pistol for now!

Killer~SafeCracker (author)2009-10-01

If you know the stock is to big then why didn't you fix it??

It could be used as a cheekrest.

Could, but for one it would not feel good.

Because I did make it smaller but took away the overall look of the gun. In other works it didn't look as good.


About This Instructable




Bio: Hi! Im tombuckey. I live in Liverpool, England. I build knex ball machines from my own ideas and also build other peoples knex guns. I ... More »
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