there are 2 kinds of copper

[roughboy]

I found out that there are 2 kinds of copper one is called flexible and the other is called rigid. what kind of copper should people use on there pneumatic spud gun? and which one of the two have more pressure rating?

[A-98]

ya, as for the pressure rating, i dunno which one would have more. but you can use the flexable one fore running from blowguns to valves, plus it looks sexy

[joannaardway]

You need semi-rigid (which is probably what you refered to as rigid) pipe for chambers and barrels. It's called semi-rigid because it is still bendable, but not easily.

Flexible pipe can be used to run things like blowguns and pressure gauges to where you want them.
However, it should be bent only once (twice tops), and then left. It's not like flexible plastic hose, as it will eventually give into metal fatigue if over-manipulated.

Usually, flexible is narrow bore, and semi-rigid is the larger diameter stuff.

The narrow bore pipe tends to have a higher pressure rating in the region of above 2000 psi.

But the larger bore pipe is still very tough. It'll take above 300 psi easily, and in the region of 1" and below, over 600 if needs be.

[Hotwired]

You can get quite sizeable flexible copper but it's incredibly naff for making barrels and chambers.

It comes in rolls which have to be straightened out and it dents more easily than rigid copper. Only good on cannons as alternatives to pressure hose.