The SVT-40 is a semi-autimatic rifle produced by the Russians in WW2. The SVT-40 was the result of the demand for a simpiliar more effective and reliable weapon to replace the SVT-38.
The SVT-40 was designed to be stripper clip fed and not to have soldiers remove the detachable magazine. But even then soldiers used multiple magazines instead of using the stripper clips.
The SVT-40 was replaced by the SKS in the late 1940s by the SKS and AK-47 rifles. The SKS and AK-47 share many design features with the SVT-40 and even some european guns have copied the design of some mechanisms.