The Byrna 8 Gram CO2 Cartridges – 10 Cartridges are custom fit for the Byrna SD and HD Launchers. The 10 pack is now including 1 CO2 cartridge with oil for simple maintenance every 10 CO2 cartridges used (9 standard CO2 cartridges). 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 will leak over time. It is recommended to swap out punctured CO2 cartridges and leave an un-punctured cartridge inside the Byrna HD to avoid any compressed air loss. The Byrna HD will puncture and fire the first round at the same time.
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