I'm not sure if this meets your requirements, and
https://articles.chicagotribune.com/2014-01-07/news/chi-citys-gun-ordinance-ruled-unconstitutional-by-federal-judge-20140106_1_gun-ordinance-gun-rights-advocates-gun-ranges
That seems to be an outright violation of the 2nd Amendment rather than a community effort to curb/control gun violence.
I'm also not sure what you mean by a "spillover" argument, but here goes:
This paragraph:
“Every year Chicago police recover more illegal guns than officers in any city in the country, a factor of lax federal laws as well as lax laws in Illinois and surrounding states related to straw purchasing and the transfer of guns,” the city's statement said. “We need stronger gun safety laws, not increased access to firearms within the city.”