Monty

might be a bit under say 430-450fps but if svd you probably looking at more:

http://www.airsoftsniperforum.com/43-longrange-aegs/6447-list-springs-vs-fps-output.html

All guns/builds are differentbut you can alter it a little by adding spacer carefully or reduce by remove bearing spring guide AoE etc...

Too many variables to roughly guess exact final fps - only an estimate at best

It's spring powered, but it uses AEG springs. Read a few posts that suggested that the 190% would output near 500 FPS, other posts (like the one you linked) say 400 to 450 FPS. We'll see.