With the exception of charging, you likely won't burst into flames. You will be violating FCC regulations/law using these on the FRS Bands.

If you choose to break the law we can't stop you, theoretically you could get busted using this. Its highly unlikely but maybe some hunting warden will bust your balls if they dont like you.

If you wanted a legal alternative, here is a set of walkie talkies that will work. They are marginally more expensive.