According to Official Guinness Records,
Standing in a line formation, Constantine Wilson, Abraham C. Robbins, Seaman Patrick Reed and DC3 Valentino Cuba (all USA) competed 26 underhand rifle exchanges in one minute at the Navy and Marine Reserve Center, Anacostia Naval Base, Washington, DC, USA, on 28 January 2006. All exchanges were interwoven and simultaneous.
Each exchange must be thrown in a line formation;i.e. – when four persons are standing in a line, person one exchanges with person three as person two exchanges with person four. A completed exchange is when the weapon is caught and counted when the weapon has broken the halfway point.
For a complete list of 2006 records, please visit 2006 Guinness Records in United States.