The Browning 22 Semi-Auto rifle, also known as the Semi Automatic 22 or SA-22, is a takedown rifle produced by FN Herstal based on a John Browning patent. The rifle is currently produced by Browning as the Semi-Auto 22. Production began in 1914 and continued through 1973 in Belgium and production continued in 1974 in Japan by Miroku. It was first exported by FN for the American market in 1956. Remington manufactured a lighter weight version under license from 1919-1935 as the Remington Model 24 and then replaced it with the Remington Model 241 in 1935. Except for the barrel locking mechanism the Remington Model 241 is very similar to the Browning SA-22. A close copy of the SA-22 was made by the Chinese company Norinco and imported into the US by Interarms as the Model ATD.