Originally Posted by sonofarex
2 other noob questions
-whats the major difference between .12 and .2? My buddy bought a crapload of .12s and they seem ok for what we use them for at the moment which is just fucking around in the back yard or whatever
The heavier the bb, the more accurate, the less affected by wind, by imperfections, and you can potentially get more range depending on your gun's setup because the heavier mass will have more forward momentum.
Nobody who actually plays airsoft seriously outdoors uses .12s since they don't shoot straight and just fly off in random directions. .12s will be okay in some CQB indoor situations.