A market trader has been found guilty under the Terrorism Act of having a gun and the address of a British soldier.
Mansha was charged under the Terrorism Act
The jury at London's Southwark Crown Court had heard that Abu Baker Mansha planned to kill or harm the soldier in revenge for his success in Iraq.
Cpl Mark Byles, 34, had been awarded the military cross after leading an attack in which five insurgents died.
Mansha, 21, of Thamesmead, south London, will be sentenced on January 26 and could be jailed for up to 10 years.
He had denied the charge of possessing a document containing information likely to be useful to a person committing or preparing an act of terrorism.
Mansha had told the court he was helping a friend research a "story".
But the prosecution said he had intended either to kill or wound Cpl Byles, of 1st Battalion, Princess of Wales Royal Regiment.
A police raid on Mansha's flat in Harold Wilson House, Arnott Close, found a blank-firing gun, which someone was trying to convert to fire live rounds.
They also found DVDs containing "virulent anti-Western propaganda", including footage of Osama Bin Laden and of hostage Ken Bigley being beheaded.
Lying in a bag was a copy of the Sun newspaper carrying an article about Cpl Byles' actions.
The article described how the soldier had led a charge on a trench of Iraqi rebels which left three insurgents dead and eight taken prisoner.
Two more Iraqis who fired from a second position had also been shot and killed, the report said.
Mr Mansha's fingerprints were on the newspaper.