It was a long time ago but a mate of mine had an Argentinian copy of a Gevarm and it stopped firing from time to time - turns out the 'firing-pin' had hammered a groove into the rear of the barrel

hence the mis-fires.
So another mate FILED down the rear of the barrel to eliminate the 'groove'!
It might give you a clue as to the quality of material used to make the rifle.
And yes, the open-bolt system is very safe:
Bolt shut? - it won't fire
Bolt open? - you can see if there's (a) a magazine there, (b) if there's any ammo in it (c) if there's somehow a round in the breech.
CAUTION: Hypothetically if you had the bolt shut and a full magazine in place and slammed the butt down on a hard surface it COULD cause the bolt to fly back but not far enough to engage the sear, this would allow it to fly forwards, strip a round out of the mag, chamber it and fire it - who knows where!
Stens operate a similar system and it has happened with them to guys making parachute drops.
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