The MainStay MacKay U.S. Infrastructure Bond Fund Class B (MCSGX) is a mutual fund that focuses on investing in bonds issued by companies involved in the development and maintenance of infrastructure in the United States. This fund aims to provide investors with a steady stream of income through interest payments from these bonds, while also seeking to preserve capital and achieve long-term growth. With a ticker symbol of MCSGX, this mutual fund is managed by MainStay Investments and offers investors the opportunity to diversify their portfolio and potentially benefit from the growth of the U.S. infrastructure sector.