Getting back to our discussion of Tokarevs. One of the reviews I read, it maybe even one I quoted from, said that slamming the magazine in could cause it to fire. This could only be true if a round was already in the chamber when a new magazine was inserted and the firing pin was free to move. If no round was chambered, the round at the top of the magazine would not be inline with the firing pin. You can't believe everything you read on the Internet, especially on forums. Gun Tests magazine did give the Yugoslavian M57 Tokarev a buy rating. I would say, anyone on a budget could do much worse. However, I talked myself out of buying one.
True, if, the slide is forward when inserting the magazine.
If it is to the rear, then it could be possible if the slide release/trigger mechanism is faulty or very sensitive and some one slams a magazine in place.
Many ranges require that the actions (slides/bolts) be opened and facing up on a bench (so as to be able to verify visually that it is in a safe state) any time the line is called to cease fire, clear and lock all weapons. When the line is to return to a hot status (commence firing) many simply insert a magazine and trip the slide release forward to chamber a round.
As example, the Remington 700 trigger assembly, one of the best factory triggers I've seen in years, but also one that has created many law suits for Remington for being faulty.
The trigger system is easily accessed for adjustment by those that are not gun smiths but it is necessary to insure that the system is not made unsafe by adjusting it too light. If it is adjusted too light the weapon has a tendency to fire when the bolt is pushed forward with force or even when simply pushing the safety tag to the safe/fire position. It must be checked repetitively to insure this condition does not happen. Since I have made my own adjustments to the trigger mechanism I check it each and every time I take the weapon out of the gun safe to verify its condition.