Yeah I'm not going to tell either, if I were you I wouldn't play with those guys.
My gun wasn't working properly so I borrowed a rental gun (M98). These guns have the velocity set at around 230 (indoor field limit) when they got them, so now they can be at almost anything. I shot a guy in the goggles but he refused to go out, so I shot him a few more times there. When he got out, his mask had a few cracks all over it. Turns out my rental was shooting at around 320 FPS. Incidently, the manager there said 'not to worry' and to keep playing, but I said hell no, I don't want to go around breaking masks.
Anything over 300FPS is just plain stupid. It'll break your mask and probably one of your nuts if your not lucky