moon clip
ring-shaped or star-shaped piece of metal designed to hold multiple firearm cartridges together as a unit, for simultaneous insertion and extraction from a revolver cylinder
en-US/ˈmun ˈklɪp/
en-GB/ˈmuːn ˈklɪp/
ring-shaped or star-shaped piece of metal designed to hold multiple firearm cartridges together as a unit, for simultaneous insertion and extraction from a revolver cylinder