I don't believe a TP smaller than 3.0mm ever works in a 12FP springer....

[Shed tuner]

Thanks for the reply.
Like you,I have a reduced cylinder PE with standard TP, I am happy with the way my one performs.
What would I gain from opening up the TP on my gun ?, reduced recoil?.
Les..

reduced piston bounce, which then allows for less spring, and therefore less recoil (yes, there's more to it, but basically...).

[les allam]

reduced piston bounce, which then allows for less spring, and therefore less recoil (yes, there's more to it, but basically...).

Ok,cheers for the info.
Les..

[T 20]

The first British built Magnum springer of the 1970s, the Webley Vulcan, had a 2.5mm transfer port.

I've used 2.5mm ports on a number of guns without problems.

[Shed tuner]

The first British built Magnum springer of the 1970s, the Webley Vulcan, had a 2.5mm transfer port.

I've used 2.5mm ports on a number of guns without problems.

as you know I'm not saying it doesn't work, just that it's not optimal...