Carbon Dioxide (CO2) Capsules

The CO₂ cartridge is a small, single-use metal cylinder filled with compressed carbon dioxide (CO₂).

It is placed in the gun as a power source for propelling the pellets (or for greater realism with Blowback).

BBs

BBs are spherical projectiles, usually small balls used in airsoft pistols/rifles (6 mm) and in certain BB-gun type airguns (.177 / 4.5 mm).