AR-15 with Narwhal tusk attachment

After London Bridge Attack the New Hotness is an AR-15 With Narwhal Tusk Attachment

A known-wolf terrorist gets out of prison in London on automatic early release. He then attempts more terrorism (knife crimes) but is eventually detained by a fire-extinguisher and a man wielding a Narwhal tusk. It only seems right that we reconsider our self-defense options.