Starr, 71, asked for 'peace and love' as he unveiled a statue he designed of a psychedelic pistol with its barrel tied in a knot.
Speaking at a Non-Violence Project Foundation event in London, the drummer said: 'If you are caught with a gun it should be a higher sentence.
'Guns are just becoming more and more. They're like the death of choice. So we hope that young people will stop.'
He also told of the 'mad moment' he heard Lennon had been shot outside his New York apartment by Mark Chapman in 1980.
Ringo added: 'My stepchildren called saying: 'Something has happened to John. He's been shot and he's dead'. You don't know what to do. You don't believe it really, but you know it's happening. It's just such a mad moment.'