A man alleged to have pulled the trigger during an attempted contract killing in Bury St Edmunds had viewed video clips about shotguns, a court has been told.
Two clips stored on a computer which were discovered by police during a search at the home of Simon Webber have been played to a jury at Ipswich Crown Court.
Prosecuting, Andrew Jackson said the videos from YouTube showed how to disassemble and then reassemble a shotgun.
Webber, 31, of Sydenham Close, Bridgwater, has denied charges of conspiracy to murder and attempted murder.
He has pleaded guilty to possession of a prohibited firearm.
Also on trial are Frank Warren, 51, of Victoria Road, Dorchester, Andrew Seaton, 40, of Frome View, Maiden Newton, Paul Baker, 35, of Neils View, Maiden Newton, and Colin Deferia, 59, of Barking, Suffolk, who have all pleaded not guilty to conspiracy to murder.
Warren and Seaton have also denied attempted murder and possession of a prohibited firearm.
The court has heard how Jonathan Catchpole was airlifted to hospital and required surgery to remove 42 shotgun pellets and cartridge wadding from his chest after being shot at point blank range at his flat in Bury St Edmunds on the evening of August 4 last year.
It is alleged that Colin Deferia was to pay £12,500 for the killing of Mr Catchpole who had previously been in a relationship with his daughter.
Mr Jackson alleged that Webber, Warren and Seaton did not attempt to conceal their identities when they stormed into Mr Catchpole’s flat armed with a sawn-off shotgun because they did not expect him to survive.
It has been claimed that Mr Catchpole was subjected to intimidation and a string of death threats, some dating back two years before the shooting took place.
The trial continues.