I use Gabbianos in a number of sizes (77, 90, 100, 120) with 16 and 20mm rubbers as my main guns.
The Seatec 20mm rubbers are quite soft, I have no problem loading them, but they have plenty of power
The Gabbiano is quite heavy out of the water, but very light in the water,(the 100 is particularly well balanced) it is the best tracking gun I have ever used
I have never seen a Pathos gun
I hope this helps
cheers
dave
www.spearo.co.uk