Police are appealing for people who hold or find illegal firearms in Greater Manchester to hand them in.
Jessie was killed in Moss Side on 9 September
The initiative, which aims to stop the weapons falling into the hands of criminals, follows the fatal shooting of Jessie James, 15, in Moss Side.
Police said they would not be taking the names of those who gave up firearms over the rest of this month.
But they said it was not an amnesty as any weapons which were involved in a crime would be investigated.
Det Supt Mike Whiting, of Greater Manchester Police, said: "If that gun were to have been used illegally in a criminal act, we would investigate the criminal act and, if we were to find who had used it and who was responsible for using that, we would prosecute them for that.
A vigil was held on the spot where Jessie was shot
"What we wouldn't do is prosecute somebody for possessing the gun."
There have been four shootings in the region since April.
Teenager Jessie James was shot near Broadfield Park in Raby Street, Moss Side, on Saturday 9 September.
A candlelit vigil was held for him on Sunday night at the spot where he was killed.
Local people gathered in Broadfield Park to say prayers and read poetry to mark his killing.
A post-mortem examination showed he was killed by three bullets - two to his torso and one to his appendix.
His killing comes less than three months after 45-year-old Ernest Gifford was shot dead at home on the same street.
And three men were shot and wounded in two separate incidents in other parts of Moss Side.
Two were injured in an incident near Great Western Street and Princes Road in August.
Later that month a 24-year-old was shot at and injured in an alleyway off Broadfield Road.
A 16-year-old girl shot in the shoulder in the neighbouring district of Whalley Range last week.