The adapter will fit inside the RAP4 buttstock, and uses two 12 gram disposable CO2 cartridges. It will fire approximately 60 rounds. When installing the adapter, it must be installed to the marker first before inserting the CO2 cartridges. Please refer to picture for orientation of CO2 cartridges when installed to the adapter.
For replacement parts, check out part number SKU: 013687 and 013671.