BASIC rule of thumb for buying airsoft BB's:

300-350 FPS: 0.20 G
 
350-400 FPS: 0.25 G
 
400-450 FPS: 0.28 G
 
450-500 FPS: 0.36 G
 
500 FPS: 0.43 G

BB's can be an inexpensive investment. But keep in mind that buying cheap BB's 

will not only cause damage to the gearbox components , but can burn a hole in your wallet for expensive repairs in the long run.

You may ask yourself , why are they so cheap ? This is because they are intended to be used for low quality Airsoft guns. If you have the chance to buy these type of BB's , you will notice their size, shape and weight is wrong . Some of them are not even perfectly round .

Most Airsoft guns are equipped with a tight drill 6 mm barrel . Wrong size BB's will not be pushed so far because these BB's are not "tight fit" with the barrel. So air can escape the bullet , instead of catching the air behind the BB's  that makes it possible to push the  BB's harder out of the barrel .
To buy cheap BB's is like putting 87 octane gasoline in a car that requires 92 octane to run properly .

So do yourself and your airsoft guns one servitude , buy quality BB's. You'll thank yourself later .

Happy Airsofting !

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