Gunner wrote

Lott's research amounts to
the largest data set that has ever been put together for any study of
crime, let alone for the study of gun control.

The size of a database is an irrelevant measure of research quality.
Garbage in=garbage out.

Lott's more guns, less crime research has been well-shredded and sent
to the dump where it belongs.

See Ayers & Donohue's articles and Maltz's article, among many others,
which demonstrate that Lott's MGLC research is invalid.