Police hunting the killer of Nairn banker Alistair Wilson will take their investigation abroad this weekend.
The weapon which killed Mr Wilson was manufactured in Germany
A senior detective will travel to eastern Germany and the Czech Republic to try and trace the history of the murder gun and the ammunition.
Det Insp Gordon Greenlees said police had received a large number of calls from the public about the weapon.
The gun, a .25 calibre semi-automatic pistol, was found in a drain nearly a mile from the murder scene.
The Inverness-based bank manager was murdered on the doorstep of his Nairn home in November 2004.
The weapon which killed Mr Wilson was manufactured in Germany by a company called Haenel Waffen of Suhl and the ammunition was manufactured by Czech Republic-based Sellier and Bellot. The detective will visit both firms.
The type of ammunition used in the murder is in current manufacture and has been for more than 30 years.
Det Insp Gordon Greenlees will travel to Europe on Sunday
Det Insp Greenlees said: "The purpose of this visit is two-fold. In the first instance we will be making inquiries at the munitions factory which manufactured the ammunition.
"We hope to establish the approximate date of manufacture of the ammunition by comparing it to the rounds used in the murder.
"This can hopefully be done by a number of means including specific markings on the cartridge and the chemical make-up of the component parts.
"In terms of the weapon our inquiries will include interviews with firearms experts in Suhl and visiting the site of the former factory which has been partially demolished."
He added: "As part of our investigation we have followed the audit trail of every round of Sellier and Bellot ammunition imported into the UK for a number of years."