Scotland Yard said it was a “miracle” that Haroon Hussain, 32, survived.
A £20,000 reward is being offered for information after a father-of-two was shot near his flat in east London.
CCTV of the attack – showing two suspects arriving at Beatrice Close, Plaistow, before shots were fired with a semi-automatic weapon – has been released by police investigating the attempted murder.
Scotland Yard said it was a “miracle” that Haroon Hussain, 32, survived the attack on June 9 last year in which more than a dozen shots were fired.
His wife found him lying on the street after the attack and he now has trouble walking, suffers from epileptic fits, short-term memory loss and is unable to use his right hand properly, police said.
Detective Sergeant Nick Hamer said a motive for the attack was not clear.
He said: “I am hoping this significant reward will prompt someone to come forward with information that will assist in helping us to identify the suspects for this attempted murder.
“It is a miracle Mr Hussain survived his injuries and it is vital the men who attacked him are apprehended.
“The use of semi-automatic weapons like this on the streets of London is still rare, but makes it is all the more important we also recover this weapon and remove it from the streets.”
Anyone with information is asked to call police on 0208 217738 or Crimestoppers anonymously on 0800 555111.
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