I haven't had any experience with handguns personally. However, my uncle and I are both pilots and I have flown with him to BC several times. He has taken shotguns before and as far as I remember all he did was declare that he was bringing it when he called ahead to have a customs agent meet us at the airport. Don't remember that much of a hassle or long guns. That said, that was probably 10 years ago so don't quote me.