Byrna CO2341 88 Gram CO2 Cylinders, 2 Pack

The box of two 88g CO2 cylinders are a perfect fit for the Byrna Mission-4. Each cylinder (new) will be good for approximately 60 rounds (or 3x Mission-4 19-round magazines) at full speed. Punctured cartridges within the Mission-4 CO2 buttstock will leak over time.

It is recommended to swap out punctured CO2 cylinders and leave an un-punctured cylinder inside the Mission-4 CO2 buttstock to avoid any compressed gas loss.