The 0.20g BB is the lightest of the common weights and the classic choice for close-quarters play and lower-powered guns. Light and fast out of the barrel, it suits indoor CQB, beginner setups, and any gun running at the lower end of the FPS scale. It is also the weight most FPS limits are measured against, so it is the one to test your gun with.
We stock quality 0.20g airsoft BBs from trusted brands like RZR. Browse the range below and grab some light, fast ammo for your CQB loadout.
A 0.20g BB leaves the barrel faster than any heavier weight at the same power, which is why FPS limits are usually quoted on 0.20g. That speed makes them well suited to close-quarters combat, where ranges are short and you want a fast, flat shot. They are also the right match for lower-powered guns and a sensible, economical choice for beginners finding their feet.
The trade-off is stability. Because they are light, 0.20g BBs are pushed around more easily by wind and lose their energy more quickly over distance, so they are less suited to long outdoor engagements.
As a rule, lighter BBs suit lower FPS and shorter ranges. A 0.20g BB is a great match for a CQB SMG or an entry-level setup, and for testing your gun’s velocity at the chrono. If you play outdoors or run a higher-powered gun, stepping up to a heavier BB like 0.25g or above will give you noticeably better stability and accuracy in the wind.
Whatever weight you run, quality matters, so pair good BBs with a well set up hop up for the best results. See the full range on our airsoft BBs page.
0.20g BBs are best for close-quarters play, lower-powered guns, and beginners. Their light weight gives a fast, flat shot at short range and makes them economical for high-volume CQB play. They are also the standard weight FPS limits are measured against, so they are ideal for chronographing your gun.
0.20g is used as the standard reference weight because it is the lightest common BB and gives a consistent baseline for measuring velocity. Sites set their FPS limits on 0.20g BBs so everyone is measured the same way. Heavier BBs read a lower FPS from the same gun, so always chronograph on 0.20g to check your site-legal velocity.
They can be used outdoors, but they are not ideal. Being light, 0.20g BBs are easily pushed off course by wind and lose energy faster over distance, which limits their accuracy at range. For outdoor and windy conditions, a heavier BB of 0.25g or above gives much better stability and range.
