Description 12 GRAM CO2 CARTRIDGES ARE ONLY COMPATIBLE WITH THE BYRNA SD and HD. Our box of ten 12g CO2 cartridges are custom fit for the Byrna SD XL launchers. Now including 1 CO2 cartridge with oil for simple maintenance every 10 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 SD XL will leak over time. It is recommended to swap out punctured CO2 cartridges and leave an un-punctured cartridge inside the Byrna SD XL to avoid any compressed air loss. The Byrna SD XL will puncture and fire the first round at the same time.
