Hw35 Leather or synthetic piston seal ?

[T 20]

Leather seal: TP 4mm
Synthetic seal: TP 3 mm

I used to think that's how they came out of the factory --- but they didn't.

I've had leather sealed guns with 2.8mm transfer ports, and one dealer in the early 1980s advertised synthetic sealed guns with 4mm transfer ports.



All the best Mick