In 1923 Lieutenant Tobiesen, working at Kongsberg Weapon Factory, designed what he called a "speed loader for repeating rifles". It can be seen as a new attempt to increase the firepower of the Krag–Jørgensen, just as the attempt to convert it to belt feed. Basically, the design consisted of a modified cover that let the user of the rifle attach a magazine from the Madsen light machine gun. The cover had a selector switch, allowing the user to select if he wanted to use the Krag–Jørgensen's internal magazine with its 5 rounds of ammunition, or if he wanted to use the external magazine with 25 rounds.