What part of their not deciding to commit the act do you not understand....guns are not the item in charge of that choice........as my links showed...access to fully automatic military rifles is easy if you want one.......that they choose not to use them isn't a matter of the gun.....or the gun control laws, since they obviously can access them when they want them.....
As to your question about the fully automatic weapon of war that is illegal in Norway, Oslo, and the entire Continent....but the terrorist, on the Norwegian terror watch list and a convicted criminal...convicted on weapons charges.....?
Matapour had a prior criminal record that included a narcotics offense and a weapons offense for carrying a knife. Investigators said they seized two weapons after Saturday's shootings: a handgun and an automatic weapon.
Norway’s prime minister and members of the royal family have joined mourners at a memorial service for the victims of a shooting attack as the capital held its annual LGBTQ Pride festival
abcnews.go.com
The attacker was arrested by police officers - who were helped by bystanders - minutes later. Two weapons were retrieved at the crime scene by police, one of them a fully automatic gun.
Royals and the prime minister joined a service to remember two killed and 21 injured near a gay bar.
www.bbc.com