190 fps on .12 g bb's is the same as 147 fps on a .20 bb
You could not practically use that gun in a skirmish whatsoever. Might want to save your money and buy a good nerf gun instead. You'd get better range and it'd be even more fun than using that crappy gun.
Considering you won't be able to play real airsoft until you're 18 (16 in some places), wasting your money on a hunk of crap is pointless. Get a nerf gun, play the same game with different ammo. If you are in a really rual area and hate the colour of nerf guns, then paint it like a gears of war gun and be a complete badass.
Hope that helps.