fps question
 

I have a gun that shoots 350 fps when using 0.12 gram bb's. now if i was to use 0.2 gram bb's does anyone know what my fps would be lowered to.

Follow this link
Gives you all the conversion utilities you need.

With 0.20 g's = 270 fps

http://www.cimmerians.org/FPS_Converter.html

-Daes-

That assumes the gun in question is not a piece of crap in the first place. If you give us more details...