It is important to follow the right procedure to install & disassemble the BLE-PM2 CO2 cartridge properly.

01:17 For your safety, if there is CO2 remains in the cartridge, please do NOT dismount it directly

01:24 Pull the trigger and then hold.
01:28 Press the hammer forward to release the CO2 in the cartridge (via the barrel)

For more info about

ICS BLE-PM2 ►https://is.gd/HfefPx
Read BLE-PM2 manual online ►https://is.gd/N53gY8