You have two choices when it comes to radios for Airsoft purposes and they each have their pros and cons. You can either use a PMR 446 or a licensed radio such as a Baofeng.   PMR 446   Comes in two types, analogue which has 8 channels and digital which is 16 channel.   Most people use analogue as digital is still expensive.   Is unlicensed so you can just buy a radio and it will work with all other PMR 446 radios.   It is limited to 0.5W.   It is lower range and penetration than a l