(Library Pictures) 1. Compatible with the STEN Gun GBB series. 2. Stamped sheet casing features a patented Slip-On design to maintain an authentic appearance. 3. Aluminium insert. 4. Capacity for 30~32 rounds of 6mm BBs. 5. For better performance, it is required to run the STEN Gun GBB series with a CO2 configuration. 6. For better performance, the Cold/Hot weather nozzle O-ring needs to be changed according to the temperature. The feed ramp becomes a consumable item when the bolt-stop function is activated.