Do you mean palsonite? Anyway, the advantage is the same as that of a teflon cylinder. It's a coating on the steel cylinder that allows for smoother bolt pull, less weight, and it's a natural lubricant.
The difference between it and the laylax teflon cylinders is that the laylax ones are actually teflon-injected stainless steel, whereas the PDI ones are coated. Practically, it makes absolutely no difference to performance.
Seeing as you're keeping it at a low fps, there's really no reason to get it. Your bolt pull is going to be minimal anyway, and there's no difference in the strength/durability between the palsonite and normal cylinders.
The difference between it and the laylax teflon cylinders is that the laylax ones are actually teflon-injected stainless steel, whereas the PDI ones are coated. Practically, it makes absolutely no difference to performance.
Seeing as you're keeping it at a low fps, there's really no reason to get it. Your bolt pull is going to be minimal anyway, and there's no difference in the strength/durability between the palsonite and normal cylinders.
