This is probably for Canadian airsoft players but it can also be applicable to everyone. With government attempts at regulating or even banning airsoft and limiting use of firearms and replica firearms to licensed ones, you might want to think of getting such. It's also for those who do real steel shooting or hunting. It's optional but for those who want some peace of mind and covering all bases to just maintain the hobby, it can be a good option. Kraken Airsoft explains why.