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Nerf Gun Modification 101

Step 3Upgrading: Part 2

Upgrading: Part 2
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The second thing is to upgrade the seal in the cylinder.

The gun comes with a tiny, almost worthless o-ring. You'll see it once you pop open that orange cylinder. Basically, the gun works by giving the spring potential energy. Then you move the bolt forward and create a large cavity of air in front of it. When you hit the trigger, the spring is released, compressing the air and forcing it out of the cylinder. It ends up going inside the dart, and this compressed air moves the dart at your target.

There are 2 ways to upgrade the seal. The first is the easiest. Get a fat o-ring that fits well. When you do this, you'll want to get one that's smaller than what you'd think would work well. Getting one that's too fat will cause the weapon to malfunction, and you won't be able to move the bolt because the o-ring exerts too much force on the walls of the cylinder.

The second way is to get a couple metal washers and a nylon washer. This is nice because it gives you a seal that's not overkill, and a little stronger than before. Unfortunately, the rest of the gun is still plastic, and in some cases weak.
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8 comments
Jun 24, 2011. 5:32 PMshadow wave rider says:
did you use the washers or an o-ring. if you used an o-ring can you tell me how big it is.
Apr 6, 2009. 9:58 AMshifty689 says:
I simply wrapped a couple of rubber bands where the o-ring was and it worked fine
Jun 24, 2011. 5:04 PMshadow wave rider says:
thats a good idea. i have tried to hunt down any o-rings i have but they are all too fat, to big or too small.
Jun 22, 2011. 3:17 PMamamie says:
how many rubber bands
Mar 29, 2010. 8:59 AMstardidi says:
 what also is to do is to put some tape  underneath the o-ring and just use the same o ring
that is what i did to my recon and it works fine for my
Aug 30, 2009. 7:56 AMmod586 says:
where can u buy a o ring like that?
Aug 19, 2009. 8:23 PMMAGnate58 says:
Do you know the width of your o ring, possibly 1/8. Also do you know of any other place to get that spring?
Feb 6, 2008. 2:22 PMArtemis says:
something else you should do is use a silicon grease or fishing reel grease to lubricate the o-ring and shaft. It provides both an easier sliding piston as well as a better air tight seal.

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Author:pinstripebob
What can I say, makin' stuff's pretty cool.