1. Safety blocks the sear, so it can't move out of the hammer notch.
2. Body movement, most ccw holsters hold the weapon in tight to the body for concealment. In the case of an ambi-safety arm movement can knock it off.
3. Yes its a real issue. But not something to turn you off to buying a 1911.
4. Up is safe, down to fire.
5. The safety can be corrected. Sometimes as easy as getting a different style holster. Other times it takes some hand fitting by a gunsmith. Usually they are to wide imo. Sometimes its a plunger problem. Maybe even a sloppy fit to the sear from the factory.
2. Body movement, most ccw holsters hold the weapon in tight to the body for concealment. In the case of an ambi-safety arm movement can knock it off.
3. Yes its a real issue. But not something to turn you off to buying a 1911.
4. Up is safe, down to fire.
5. The safety can be corrected. Sometimes as easy as getting a different style holster. Other times it takes some hand fitting by a gunsmith. Usually they are to wide imo. Sometimes its a plunger problem. Maybe even a sloppy fit to the sear from the factory.