Don't know what weight of BBs your gun needs? Here are a few guidelines:
We recommend using heavier BBs for more powerful airsoft guns for greater accuracy.
Metal gear AEGs should use .20 gram or heavier, high polish, competition grade BBs.
Bolt action snipers should .28 gram BBs or higher for higher accuracy.
Greater BB weight increases accuracy but lowers velocity.
Less expensive guns ($50 or less range) should generally use .12 gram BBs
0.20g BBs are an all around good choice for most airsoft guns that shoot in the 250-370 FPS range. They are also the most economical choice.
0.25g BBs are more accurate than 0.20g BBs but don't shoot quite as far. We recommend these for airsoft guns that shoot in the 350-425 FPS range.
0.30g BBs are an excellent choice for Sniper Rifles that chrono over 425 FPS. They perform much better over long distances and are less affected by wind.
Biodegradable BBs, also called Bio BBs, are a great environmentally friendly alternative choice for your airsoft gun. They are made out of a specially compressed biodegradable fiber and coated with resin that breaks down when exposed to the elements. They are available in a variety of weights!