The couples - some of them renewing their vows while others were exchanging them for the first time - are worshipers at the World Peace and Unification Sanctuary, also known as the Sanctuary Church.
The church, in Newfoundland, Pennsylvania, is led by Hyung Jin Moon, who called on his followers to bring unloaded rifles to the ceremony.
The crowns, says the church, represent the "sovereignty of Kings and Queens."
The rifles - similar to the one used in the Florida massacre - are the "rod of iron" that symbolize defending one's family and community.
The church, which also calls itself Rod of Iron Ministries, is an offshoot of the Unification Church, founded by Hyung Jin's father, the late Rev. Sun Myung Moon.
To their followers, Sun Myung is the "True Father" and his son is the "Second King" - the True Father's anointed heir.
Wednesday's ceremony came amid a pitched debate over assault-style rifles, one of which authorities said was used to kill 17 people at Marjory Stoneman Douglas High School in Parkland, Florida, two weeks ago. The church ceremony raised concerns among officials of a nearby elementary school in Newfoundland, where Wallenpaupack Area School District officials decided to temporarily move students as a safety precaution, although church officials assured that the weapons were not loaded.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
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