Can I ask why you want a springer with fac output?
Unless you do indeed get a HW80, it won't last. Honest. I don't think the supersport was ever meant to be anything other than a sub 12 model. I maybe wrong, but the sheer stress levels mean it would fall apart over a short period of time. If you want a rifle that will last and output over 12, it'll only be a . You could look as a gas ram power plant in the eliminator from theoben, a real old school rabbit basher, but there rare and a handful to say the least.
No offence here but what's your experience with shooting springers? With an