A move by Pittsburgh to ban certain types of weapons and ammunition within the city has made it a target for a major open-carry gun rally planned for high noon today.

As the Pittsburgh Post-Gazette reports, Justin Dillon and his group Open Carry Pennsylvania are expecting some 500 gun carriers to converge at the portico of the City-County Building, with their weapons in tow.

Dillon told the newspaper the gun rally, set for noon today, is intended to "show that we're not silent. The Second Amendment is important to us. [Open carrying] is our constitutional right. We're here, and we're responsible."

In 2014, Dillon mounted a successful legal case against a similar gun ban in Erie, Pa., with the Commonwealth Court ruling state law prohibits municipalities and counties from regulating firearms or ammunition "ownership, possession, transfer or transportation" in any way that differs from state regulations. As a result Erie repealed its city park gun ban.

Despite that case, Pittsburgh Mayor William Peduto said at a press conference on the city’s proposed legislation in December that Pittsburgh was willing to challenge the constitutionality of the state law if need be, the Post-Gazette reported.

That has set the stage for today’s Second Amendment clash.