There is no direct evidence in the provided sources that Zohran Mamdani explicitly called out other states for weak gun laws allowing illegal arms flow into New York, specifically referencing the AR-15 used by the Manhattan gunman.
Zohran Mamdani calls out other states for weak gun laws that allow for flow of illegal arms into New York such as AR-15 used by Manhattan gunman

FactVerify
Source: factverify.com
Key Evidence
Sources show Mamdani reacting to the NYC shooting and engaging in gun reform debates,
townhall.comtownhall.comHere's the Part of Zohran Mamdani's Statement After NYC Shooting That Set People...
ny1.comny1.comManhattan shooting sparks renewed Democratic calls for gun reform; GOP...
hindustantimes.comhindustantimes.comZohran Mamdani reacts to horrific Midtown Manhattan shooting that killed 4,... but none provide direct quotes or statements where he blames other states' weak gun laws for illegal arms entering New York or specifically mention the AR-15 used by the shooter.
What the Evidence Shows
The claim that Zohran Mamdani called out other states for weak gun laws facilitating the flow of illegal arms into New York, such as the AR-15 used by the Manhattan gunman, is not directly supported by the available sources. While Mamdani has made statements reacting to the Manhattan shooting and has been involved in discussions about gun control and policing reforms, none of the referenced articles explicitly document him blaming other states' gun laws for the illegal arms flow into New York.
The sources discuss his reactions to the shooting, political attacks against him, and general calls for gun reform but do not confirm this specific claim. Therefore, without explicit statements or documented evidence from credible sources, this claim remains unverifiable based on current information.