27 dead in school shooting

How about Brazil?

35,000 firearm murders in 2008 (last known statistic year)
Less than 200,000,000 people.
18.1 firearm homicide rate per 100k people.
Banned most private firearm ownership.

US:

9,100 firearm murders in 2009
Over 300,000,000 people
2.98 firearm homicide rate per 100k people.
Gun ownership is mostly free.

Switzerland:
40 firearm murders in 2010
Under 8,000,000 people
.52 firearm homicide rate per 100k people.
Require firearm ownership for males 20-30. Also allows them to take home their legit assault rifles they use in the military.

Kennesaw, Georgia:
0 firearm murders (actually, murders in general) over the last 25 years.
30,000 people.
0 firearm homicide rate per 100k people
Consistently rated one of safest towns in US.
Requires every home to have a firearm (doesn’t matter type) for protection in case police don’t make it in time.