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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.
Yes i suppose any thermoplastic will work but there are plastics on the market that are made for their low friction properties, so if one of those were used then the bolt pull could be very light. Combine it with a teflon cylinder and it could be ridiculously smooth, to the point where the only resistance is the spring itself.

I will be trying a version of this before the weekend to game on Sunday.
 

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I have found a supplier of Teflon/PTFE pipe, as Reaper93 says...it is expensive compared to other options. i am just waiting to find if they can give the ID i want and what their tolerance is.

I have found delrin and Nylon6 tubes, a lot less expensive than the teflon/PTFE but the tolerances on them are shocking. it will require accurate machining to make them work.

I also had a bit of a chat with Careful (such a helpful guy!!), for anything more accurate than Reaper93's mod you will also need to look at boring out you receiver to smooth and slightly enlarge it. material costs and machining cost wise you will probably be better off having a pro do it and buying a receiver with sleeve fitted from Careful.
 

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Update: Supplier has come back to me, the PTFE tuber, which are rigid, unfortunately do not come with a 24mm ID just 25mm with a tolerance of +/- 0.1mm. this will leave a larger gap then the current guide rings and so will be useless

Also TM receiver cannot use 0.8mm material far too thick, now looking for 0.5mm or will bore the receiver out a bit but as i do not have a machine for this it will be by hand, so not exactly precise.

Regarding the tolerances (though diameter would be a more correct term here) - I left the same diameter as on original rings. Cylinder head acts as a base surface with hop up unit. So some clearance between rings and cylinder is not an issue. That gap even helps to reduce friction.
I said tolerance because I meant tolerance. the supplier I found for the nylon-6 and acetal (Delrin) tubes offers a 25mm ID but with a tolerance of 23mm to 24.4mm ID with the idea that you finish it to your requirement yourself. Hardly precision engineering. if it came as 24.4 guaranteed i would snap it up. Also have a huge 5.5mm wall thickness so much machining would be required.....the hunt continues.

As for the gap....the point of the mod is to help centre the bolt and remove the inherent wobble which is a result of mass production of a non precision item (the receiver). We aim for a tight fit (Careful aims for +0.05mm from cylinder diameter) to achieve this and so then we must look to low friction materials to allow for a smooth action as well as a well centred one.

Teflon is kinda soft as raw material. Nylon/PA6 isn't the best option for sliding. I used Ertalyte for receiver glide rings and piston glide rings. Now the bolt pull with teflon cylinder is very smooth. SPR380 spring feels like M150.
Thanks for the advice, i will look for this too.
 
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