Our box of ten 8g CO₂ cartridges are custom fit for the Byrna SD and HD Launchers. Now including 1 CO₂ cartridge with oil for simple maintenance with every 10th CO₂ cartridges used. Each cartridge (new) will be good for 15-20 rounds (4 mags in a 5-round magazine) at full speed. Punctured cartridges within the Byrna HD or SD will leak over time.

It is recommended to swap out punctured CO₂ cartridges and leave an un-punctured cartridge inside the Byrna HD or SD to avoid any compressed air loss. The Byrna HD and SD will puncture and shoot the first round at the same time.