Some of you are still confusing half open bolt with half cock: they are 2 completely different scenarios.
A half open bolt is when the cartridge is half way into the chamber, so the bolt needs to be fully closed before the shot can be taken. If your trigger hand holds the pistol grip immediately behind the rear of the bolt, the bolt can't slide back and cause the round to drop out.
Re manufacturers not producing safety catches if they were faulty, I'm sure they all leave the factory in good working condition. But a safety catch is a mechanical device, and ANY mechanical device can fail or malfunction, through age, misuse, or wear.
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