Battle sight zero / Gerald Seymour.

"The Kalashnikov AK47. A weapon with a unique image. A symbol of freedom fighters and terrorists across the globe. Undercover officer Andy Knight has infiltrated an extremist group intent on bringing the rifle to Britain -- something MI5 have been struggling for years to prevent. He befriends Zeinab, the young Muslim student from Yorkshire who is at the centre of the plot. All Zeinab needs to do is travel to the impoverished high-rise estates of Marseilles and bring one rifle home on a test run. Then many more will follow -- and with them would come killing on an horrendous scale. Zeinab is both passionate and attractive, and though Andy knows that the golden rule of undercover work is not to get emotionally attached to the target, sometimes rules are impossible to follow."-- Publisher's description.