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Weapons similar to those used by the Christchurch mass murderer are legally on sale in Britain, despite the government’s boast that gun laws are the toughest in the world.

Semi-automatic shotguns, some of which are designed to look like AK47 assault rifles, can be bought online and from gun dealers around the country, The Times has found.

These combat-style shotguns fire cartridges but can be fitted with magazines holding up to ten rounds that can be discharged rapidly without any need to reload. Gun control campaigners say the weapons have been specifically designed to exploit loopholes in the legislation.

Brenton Tarrant, the alleged killer of 50 people in two mosques in New Zealand, had five weapons — two of which were legally owned shotguns — when he…