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Discussion Starter · #1 · (Edited)
Surfing on YT I found an interesting video, here it is:

Starting from this idea I thought: "Why not shimming the entire receiver too?"

So the purpose of this MOD is to make the cycling more sturdy and solid, centering the cylinder perfectly into the hop up chamber and preventing dirt comes into the receiver.

Taking measurement with a caliber the diameter of the cylinder results of 24mm and the receiver 25.9mm (MB03, the Bar10 has a tighter receiver)
The 1,9mm left must be filled!

So I bought a 0,8mm plastic sheet for more on less 1€ and cut a strip from it about 7x12cm.
I folded it with a thermo-pistol (industrial phon) using an old VSR cylinder as a reference.
Product Textile Purple Grey Sleeve


The plastic cylinder must be as regular and smooth as possible, so I helped myself with a pvc pipe used as a stamp, inserting the plastic shimmer inside, and inside of it i inserted the vsr cylinder, heating everything up with the termo-pistol.

Inserting the shimmer into the receiver I obtained this:
Hand Finger Wood Gas Thumb


Then the receiver looked like this!
Remember to lube the shimmer with silicone spray
Camera accessory Gas Carbon Cameras & optics Auto part


Now the cycling is really sturdy and solid, the cylinder head goes perfectly into the hop up unit and no dirt will get inside the receiver anymore! :tup:
 

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Discussion Starter · #3 ·
Absolutely yes, the cylinder is smooth and feels really solid.

However use my measurement as a guide, but check your rifle before buying the sheet, as I noticed working with so small tolerances can be a problem.
 

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Discussion Starter · #5 ·
Good point.
Honestly I don't know what kind of plastic it is precisely.
It is really smooth and clean.
Feels like the plastic used to make book covers, or photo covers.
I just went to a brico and cut a piece from a roll, btw I will suggest that any kind of smooth plastic will work if you lube it with silicone spray.
 

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Discussion Starter · #10 ·
I would also raccommend Teflon, but it's expensive and hard to work.

Btw the key is to "go cheap" when possible, so this is my solution ;)
 

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Discussion Starter · #13 ·
Not necessarily.
The purpose of this mod is to avoid yokes between the cylinder and the rings, making the cycling more stable compressing the spring on a precise axis.
Ideally there is no excessive contact between the cylinder and the sleeve, btw the lubrication would avoid friction between the parts.
I found this as an improvement for my rifles, and I've done this on every vsr I have.

Not only decent material rings, but you need the exact tolerance to make them work correctly with your cylinder.
 

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Discussion Starter · #16 ·
Because standard rings just sucks! lol
If you check them they have an inner diameter too large for the cylinder, and they are made of some kind of shitty plastic.

I haven't the possibility to work with nylon or other materials atm, so I just made the sleeve out of a material I can work with.

I would say a rigid teflon tubing would work way better IMO, but it's really hard to work if you don't have the right tools and machinery.
 

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Discussion Starter · #18 ·
Making the shimmer out of teflon...

Have you ever tried frictioning teflon on teflon? It feels like ice on ice.
 
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