Poly port size vs strength?

[Doc Sharptail]

Standard 1/4" o.d. x 3/16" i.d. poly ice maker tubing holds up well even to 3 K psi, as long as the end cuts are square, and the length right...

I usually cut mine with a 3/16" drill inside the tubing, with a small plumber's tubing cutter. This seems to get the square ends required.

That being said, I'm not really a fan of poly tubing~ especially on a gun that is going to see a lot of dis/re-assembly that good tuning seems to require. I still like the metal t.p. of the xx systems, and stay with it as much as possible. They are not that easy to drill out for expansion, but their longetivity is well worth the careful approach to expanding them.

Regards,

Doc Sharptail

[sholo]

I'm not really a fan of poly tubing~ especially on a gun that is going to see a lot of dis/re-assembly that good tuning seems to require. I still like the metal t.p. of the xx systems, and stay with it as much as possible.

I'm not either, but it's pretty hard to get a 3/16" ID port using a 22xx metal sleeve...

Actually, inside diameter is of little concern to me- the 1/4" outside dia. is what I was after.

I'm the complete opposite - after seeing how even tiny changes in TP diameter affects fps/fpe numbers, ID is what's important to me. Being a .25 cal, I want the valve to "breathe" as well as it can. Just wasn't sure about strength or sealing ability using 1/4" vs 5/16" OD material.

Kind of redundant now anyways though as I picked up some 5/16" OD x 3/16" ID poly tube the other day. Figured if I was worried enough to ask the question in the first place, plus Bob pointing out that although 1/4" CAN seal properly with the thin wall (albeit a bit finicky), I decided to just go ahead and use 5/16" OD instead...