You can't say this happened in a "gun-free zone" because this is where they keep all the guns.
A Mississippi gun store owner and his son were shot and killed by customers who were apparently upset that repairing their guns isn't free.
A gun-store owner and his son were killed in a shootout with two customers after an argument over a $25 firearm repair fee, police told NBC station WDSU. [...]
The customers, who are also a father and son, had visited the store to collect a firearm that had been dropped off for repair. They became irate after being told it was not ready and there would be a $25 service charge, the Pearl River County Sheriff's Office told WDSU.
Part of me wants to say 'fine, let all the gun fetishists kill each other. Who cares?' but I know the overwhelming majority of victims are innocent people. Children and unsuspecting bystanders are killed on a daily basis by the proliferation of guns.