I will not pretend to know the answer to your question. I am seeing too many opinions here. I would not take anyones word for it here. I believe real professional advice would be good to look into. Not just for your friend, but also for yourself. If a felon can be arrested (I am pretty sure they can be) you might also be responsible for allowing them to handle your gun.
Romans 1:16 I am not ashamed of the gospel, because it is the power of God for the salvation of everyone who believes: first for the Jew, then for the Gentile.