More than 200 firearms have been handed in to police during a two-week amnesty.
They include an AK-47 and an Uzi sub-machine gun.
Both are deactivated, but police chiefs stressed they look very real and could have been used for crime in the wrong hands.
A huge, deactivated Bren machine gun dating back to the Second World War was also given up during the Manchester-wide surrender.
Superintendent Danny Inglis said a number of guns handed in were live firing.
"If you get one of these pointed at you, you wouldn't know it was a replica or a real firearm," he said.
"Some of them are live-firing, replicas and antiques. I am really pleased with the response."
The fortnight-long amnesty was held as part of a national firearms surrender as gun crime rises again both locally and nationally.
It's aim was to take potentially deadly weapons of all types off the street - and ultimately save lives.
"The aim of the campaign was to get weapons that could fall into the wrong hands," said Supt Inglis.
"Some of these weapons will have been held by people that have an interest in guns, they like collecting antiques.
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"But what is really important is if they fall into the wrong hands, it means that criminals could end up with those weapons.
"The firearms surrender was a great success and any gun that gets handed in is one less on the street for criminals to get their hands on.
"The success of the surrender is as a result of continued efforts from officers, and our partners working together to safeguard, intervene and educate at the earliest opportunity."
A Brocock revolver, which is illegal to possess, has also been handed in, police said.
GMP chiefs have stressed the amnesty is also being aimed at collectors, licence holders and anyone who has inherited a firearm.
Many firearms are held in 'innocence and ignorance of their illegality', or may have been simply forgotten in people's homes, the force said.
The last firearms surrender in Greater Manchester, staged over a two week period in 2017, saw 243 weapons handed in at police stations. Of them, 68 were found to be 'viable' weapons capable of being fired.
