Introduced in 1900, these 6.5mm Carcano or 7.65×53mm gas-operated, selective-fire carbines attracted considerable attention at the time.[4][5] They used 10-, 20- and 50-round box magazines.[5] The Cei-Rigotti had several failings, including frequent jams and erratic shooting.[5] In the end, no Army took an interest in the design and the rifle was abandoned before it could be further developed.[5] Although the rifle was never officially adopted by any military, it was tested extensively by the Italian Army during the lead-up to the First World War.[6]