Scaffolder Jordan Griffiths told The Sun that his pregnant girlfriend found the bag in south London on Tuesday evening.
Inside the bag was an MP5 semi-automatic Heckler & Koch carbine, a Glock pistol, taser and ammunition, the newspaper reported.
“My partner saw the bag sitting in the road by the kerbside and became suspicious. She went over to it and kicked it to see what it might be. But it was really heavy and didn’t move,” he said.
“It was lucky one of the guns inside didn’t go off or else she and our baby, due next month, could have been shot and killed.”
Griffiths said he was in “shock” after discovering what was inside.
“The bag was really heavy. I thought it might be full of coins and took it inside using both my hands because of its weight. I took it upstairs and put it on my bed and opened the bag up. I could not believe my eyes.”
