0.20g bb pellets Are the standard and most commonly used Airsoft bb pellet for most guns on this site and best used with mid to hi end electric rifles and powerful gas and spring pistols. a rough guide would be for example bb guns that shoot between 210 to 350 fps to use the 0.20g bbs here. we do also sell marking pellets and tracer, glow in the dark & Biodegradable pellets at this weight as well. Need more info? Click here to see our BB Pellet Buying Guide.