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https://generalstorespokane.com/pages/byrna-shipping-rules
This Byrna Boost Adaptor conveniently allows you to use standard and readily available 12 gram CO2 cartridges, delivering an increase in shot capacity to 30 rounds per cartridge. Easy to install.
Increased payload: 50% more shots per CO2 canister
Convenience: 12g CO2 readily available everywhere
Compatible with the Byrna SD / EP or HD launcher.