The Washington Post is reporting that Dylann Roof was given the .45
Glock by his father back in April.

By law, Roof could not purchase a firearm in SC because he
had a felony charge pending (drugs). According to the Washington Post
a FFL would have run a background check and the charge would have come
up disallowing Roof from purchasing it.

But the loophole was the private transfer. SC (along with 40 other
states) does not require a background check for personal transfers.

Seems we've had this debate before.